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Finding the Fourth Proportional to 509,590.80, 764,386.20 and 391,856.40

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Solution

The fourth proportional to 509,590.80, 764,386.20 and 391,856.40 is: 587,784.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    509,590.80 : 764,386.20 = 391,856.40 : x
  2. Step 2: Convert to fraction form
    509,590.80/764,386.20 = 391,856.40/x
  3. Step 3: Cross multiply
    509,590.80x = 764,386.20 × 391,856.40
  4. Step 4: Simplify right side
    509,590.80x = 299,529,624,541.68
  5. Step 5: Solve for x
    x = 299,529,624,541.68/509,590.80
  6. Step 6: Final answer
    x = 587,784.60

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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.