Home / 138,972.64-191,781.76-75,312

Finding the Fourth Proportional to 138,972.64, 191,781.76 and 75,312

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Solution

The fourth proportional to 138,972.64, 191,781.76 and 75,312 is: 103,930.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,972.64 : 191,781.76 = 75,312 : x
  2. Step 2: Convert to fraction form
    138,972.64/191,781.76 = 75,312/x
  3. Step 3: Cross multiply
    138,972.64x = 191,781.76 × 75,312
  4. Step 4: Simplify right side
    138,972.64x = 14,443,467,909.12
  5. Step 5: Solve for x
    x = 14,443,467,909.12/138,972.64
  6. Step 6: Final answer
    x = 103,930.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.