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Finding the Fourth Proportional to 81,147.40, 121,721.10 and 21,990.40

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Solution

The fourth proportional to 81,147.40, 121,721.10 and 21,990.40 is: 32,985.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,147.40 : 121,721.10 = 21,990.40 : x
  2. Step 2: Convert to fraction form
    81,147.40/121,721.10 = 21,990.40/x
  3. Step 3: Cross multiply
    81,147.40x = 121,721.10 × 21,990.40
  4. Step 4: Simplify right side
    81,147.40x = 2,676,695,677.44
  5. Step 5: Solve for x
    x = 2,676,695,677.44/81,147.40
  6. Step 6: Final answer
    x = 32,985.60

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Similar ratio
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1.5x scale

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.