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Finding the Fourth Proportional to 509,767.20, 764,650.80 and 438,908.40

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Solution

The fourth proportional to 509,767.20, 764,650.80 and 438,908.40 is: 658,362.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    509,767.20 : 764,650.80 = 438,908.40 : x
  2. Step 2: Convert to fraction form
    509,767.20/764,650.80 = 438,908.40/x
  3. Step 3: Cross multiply
    509,767.20x = 764,650.80 × 438,908.40
  4. Step 4: Simplify right side
    509,767.20x = 335,611,659,186.72
  5. Step 5: Solve for x
    x = 335,611,659,186.72/509,767.20
  6. Step 6: Final answer
    x = 658,362.60

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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.