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Finding the Fourth Proportional to 138,428.10, 207,350.55 and 138,428.10

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Solution

The fourth proportional to 138,428.10, 207,350.55 and 138,428.10 is: 207,350.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,428.10 : 207,350.55 = 138,428.10 : x
  2. Step 2: Convert to fraction form
    138,428.10/207,350.55 = 138,428.10/x
  3. Step 3: Cross multiply
    138,428.10x = 207,350.55 × 138,428.10
  4. Step 4: Simplify right side
    138,428.10x = 28,703,142,670.46
  5. Step 5: Solve for x
    x = 28,703,142,670.46/138,428.10
  6. Step 6: Final answer
    x = 207,350.55

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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.