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Finding the Fourth Proportional to 138,812.60, 207,927.30 and 76,410.20

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Solution

The fourth proportional to 138,812.60, 207,927.30 and 76,410.20 is: 114,454.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,812.60 : 207,927.30 = 76,410.20 : x
  2. Step 2: Convert to fraction form
    138,812.60/207,927.30 = 76,410.20/x
  3. Step 3: Cross multiply
    138,812.60x = 207,927.30 × 76,410.20
  4. Step 4: Simplify right side
    138,812.60x = 15,887,766,578.46
  5. Step 5: Solve for x
    x = 15,887,766,578.46/138,812.60
  6. Step 6: Final answer
    x = 114,454.79

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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.