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Finding the Fourth Proportional to 28,265.76, 38,957.76 and 21,179.88

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Solution

The fourth proportional to 28,265.76, 38,957.76 and 21,179.88 is: 29,191.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,265.76 : 38,957.76 = 21,179.88 : x
  2. Step 2: Convert to fraction form
    28,265.76/38,957.76 = 21,179.88/x
  3. Step 3: Cross multiply
    28,265.76x = 38,957.76 × 21,179.88
  4. Step 4: Simplify right side
    28,265.76x = 825,120,681.87
  5. Step 5: Solve for x
    x = 825,120,681.87/28,265.76
  6. Step 6: Final answer
    x = 29,191.53

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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.