Home / 81,148.13-121,712.78-21,988.27

Finding the Fourth Proportional to 81,148.13, 121,712.78 and 21,988.27

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Solution

The fourth proportional to 81,148.13, 121,712.78 and 21,988.27 is: 32,979.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,148.13 : 121,712.78 = 21,988.27 : x
  2. Step 2: Convert to fraction form
    81,148.13/121,712.78 = 21,988.27/x
  3. Step 3: Cross multiply
    81,148.13x = 121,712.78 × 21,988.27
  4. Step 4: Simplify right side
    81,148.13x = 2,676,253,219.78
  5. Step 5: Solve for x
    x = 2,676,253,219.78/81,148.13
  6. Step 6: Final answer
    x = 32,979.85

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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.