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Finding the Fourth Proportional to 38,753.85, 53,480.87 and 21,761.78

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Solution

The fourth proportional to 38,753.85, 53,480.87 and 21,761.78 is: 30,031.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,753.85 : 53,480.87 = 21,761.78 : x
  2. Step 2: Convert to fraction form
    38,753.85/53,480.87 = 21,761.78/x
  3. Step 3: Cross multiply
    38,753.85x = 53,480.87 × 21,761.78
  4. Step 4: Simplify right side
    38,753.85x = 1,163,838,550.94
  5. Step 5: Solve for x
    x = 1,163,838,550.94/38,753.85
  6. Step 6: Final answer
    x = 30,031.56

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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.