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Finding the Fourth Proportional to 100,553.97, 138,666.82 and 67,920.15

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Solution

The fourth proportional to 100,553.97, 138,666.82 and 67,920.15 is: 93,663.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,553.97 : 138,666.82 = 67,920.15 : x
  2. Step 2: Convert to fraction form
    100,553.97/138,666.82 = 67,920.15/x
  3. Step 3: Cross multiply
    100,553.97x = 138,666.82 × 67,920.15
  4. Step 4: Simplify right side
    100,553.97x = 9,418,271,214.42
  5. Step 5: Solve for x
    x = 9,418,271,214.42/100,553.97
  6. Step 6: Final answer
    x = 93,663.84

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1.5x scale

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.