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Finding the Fourth Proportional to 28,607.75, 39,481.02 and 15,862.20

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Solution

The fourth proportional to 28,607.75, 39,481.02 and 15,862.20 is: 21,891.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,607.75 : 39,481.02 = 15,862.20 : x
  2. Step 2: Convert to fraction form
    28,607.75/39,481.02 = 15,862.20/x
  3. Step 3: Cross multiply
    28,607.75x = 39,481.02 × 15,862.20
  4. Step 4: Simplify right side
    28,607.75x = 626,255,687.39
  5. Step 5: Solve for x
    x = 626,255,687.39/28,607.75
  6. Step 6: Final answer
    x = 21,891.12

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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.