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Finding the Fourth Proportional to 138,354.32, 207,336.84 and 79,101.20

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Solution

The fourth proportional to 138,354.32, 207,336.84 and 79,101.20 is: 118,540.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,354.32 : 207,336.84 = 79,101.20 : x
  2. Step 2: Convert to fraction form
    138,354.32/207,336.84 = 79,101.20/x
  3. Step 3: Cross multiply
    138,354.32x = 207,336.84 × 79,101.20
  4. Step 4: Simplify right side
    138,354.32x = 16,400,592,848.21
  5. Step 5: Solve for x
    x = 16,400,592,848.21/138,354.32
  6. Step 6: Final answer
    x = 118,540.52

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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.