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Finding the Fourth Proportional to 28,672.80, 43,009.20 and 15,988.20

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Solution

The fourth proportional to 28,672.80, 43,009.20 and 15,988.20 is: 23,982.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,672.80 : 43,009.20 = 15,988.20 : x
  2. Step 2: Convert to fraction form
    28,672.80/43,009.20 = 15,988.20/x
  3. Step 3: Cross multiply
    28,672.80x = 43,009.20 × 15,988.20
  4. Step 4: Simplify right side
    28,672.80x = 687,639,691.44
  5. Step 5: Solve for x
    x = 687,639,691.44/28,672.80
  6. Step 6: Final answer
    x = 23,982.30

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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.