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Finding the Fourth Proportional to 478,516.20, 717,428.70 and 268,218.60

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Solution

The fourth proportional to 478,516.20, 717,428.70 and 268,218.60 is: 402,134.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,516.20 : 717,428.70 = 268,218.60 : x
  2. Step 2: Convert to fraction form
    478,516.20/717,428.70 = 268,218.60/x
  3. Step 3: Cross multiply
    478,516.20x = 717,428.70 × 268,218.60
  4. Step 4: Simplify right side
    478,516.20x = 192,427,721,513.82
  5. Step 5: Solve for x
    x = 192,427,721,513.82/478,516.20
  6. Step 6: Final answer
    x = 402,134.18

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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.