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Finding the Fourth Proportional to 39,877.57, 55,031.10 and 21,728.20

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Solution

The fourth proportional to 39,877.57, 55,031.10 and 21,728.20 is: 29,984.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,877.57 : 55,031.10 = 21,728.20 : x
  2. Step 2: Convert to fraction form
    39,877.57/55,031.10 = 21,728.20/x
  3. Step 3: Cross multiply
    39,877.57x = 55,031.10 × 21,728.20
  4. Step 4: Simplify right side
    39,877.57x = 1,195,726,747.02
  5. Step 5: Solve for x
    x = 1,195,726,747.02/39,877.57
  6. Step 6: Final answer
    x = 29,984.95

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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.