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Finding the Fourth Proportional to 509,623.60, 764,435.40 and 439,639.60

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Solution

The fourth proportional to 509,623.60, 764,435.40 and 439,639.60 is: 659,459.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    509,623.60 : 764,435.40 = 439,639.60 : x
  2. Step 2: Convert to fraction form
    509,623.60/764,435.40 = 439,639.60/x
  3. Step 3: Cross multiply
    509,623.60x = 764,435.40 × 439,639.60
  4. Step 4: Simplify right side
    509,623.60x = 336,076,073,481.84
  5. Step 5: Solve for x
    x = 336,076,073,481.84/509,623.60
  6. Step 6: Final answer
    x = 659,459.40

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.