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Finding the Fourth Proportional to 138,656.80, 207,985.20 and 129,908.80

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Solution

The fourth proportional to 138,656.80, 207,985.20 and 129,908.80 is: 194,863.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,656.80 : 207,985.20 = 129,908.80 : x
  2. Step 2: Convert to fraction form
    138,656.80/207,985.20 = 129,908.80/x
  3. Step 3: Cross multiply
    138,656.80x = 207,985.20 × 129,908.80
  4. Step 4: Simplify right side
    138,656.80x = 27,019,107,749.76
  5. Step 5: Solve for x
    x = 27,019,107,749.76/138,656.80
  6. Step 6: Final answer
    x = 194,863.20

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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.