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Finding the Fourth Proportional to 83,314.88, 124,972.32 and 20,990.24

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Solution

The fourth proportional to 83,314.88, 124,972.32 and 20,990.24 is: 31,485.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,314.88 : 124,972.32 = 20,990.24 : x
  2. Step 2: Convert to fraction form
    83,314.88/124,972.32 = 20,990.24/x
  3. Step 3: Cross multiply
    83,314.88x = 124,972.32 × 20,990.24
  4. Step 4: Simplify right side
    83,314.88x = 2,623,198,990.16
  5. Step 5: Solve for x
    x = 2,623,198,990.16/83,314.88
  6. Step 6: Final answer
    x = 31,485.36

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Double scale
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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.