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Finding the Fourth Proportional to 28,517.76, 42,713.28 and 21,895.20

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Solution

The fourth proportional to 28,517.76, 42,713.28 and 21,895.20 is: 32,794.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,517.76 : 42,713.28 = 21,895.20 : x
  2. Step 2: Convert to fraction form
    28,517.76/42,713.28 = 21,895.20/x
  3. Step 3: Cross multiply
    28,517.76x = 42,713.28 × 21,895.20
  4. Step 4: Simplify right side
    28,517.76x = 935,215,808.26
  5. Step 5: Solve for x
    x = 935,215,808.26/28,517.76
  6. Step 6: Final answer
    x = 32,794.15

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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.