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Finding the Fourth Proportional to 509,387.80, 764,081.70 and 257,445.40

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Solution

The fourth proportional to 509,387.80, 764,081.70 and 257,445.40 is: 386,168.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    509,387.80 : 764,081.70 = 257,445.40 : x
  2. Step 2: Convert to fraction form
    509,387.80/764,081.70 = 257,445.40/x
  3. Step 3: Cross multiply
    509,387.80x = 764,081.70 × 257,445.40
  4. Step 4: Simplify right side
    509,387.80x = 196,709,318,889.18
  5. Step 5: Solve for x
    x = 196,709,318,889.18/509,387.80
  6. Step 6: Final answer
    x = 386,168.10

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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.