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Finding the Fourth Proportional to 138,069.60, 206,973.15 and 88,009.20

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Solution

The fourth proportional to 138,069.60, 206,973.15 and 88,009.20 is: 131,930.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,069.60 : 206,973.15 = 88,009.20 : x
  2. Step 2: Convert to fraction form
    138,069.60/206,973.15 = 88,009.20/x
  3. Step 3: Cross multiply
    138,069.60x = 206,973.15 × 88,009.20
  4. Step 4: Simplify right side
    138,069.60x = 18,215,541,352.98
  5. Step 5: Solve for x
    x = 18,215,541,352.98/138,069.60
  6. Step 6: Final answer
    x = 131,930.14

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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.