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Finding the Fourth Proportional to 28,250.92, 38,990.90 and 15,679.72

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Solution

The fourth proportional to 28,250.92, 38,990.90 and 15,679.72 is: 21,640.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,250.92 : 38,990.90 = 15,679.72 : x
  2. Step 2: Convert to fraction form
    28,250.92/38,990.90 = 15,679.72/x
  3. Step 3: Cross multiply
    28,250.92x = 38,990.90 × 15,679.72
  4. Step 4: Simplify right side
    28,250.92x = 611,366,394.55
  5. Step 5: Solve for x
    x = 611,366,394.55/28,250.92
  6. Step 6: Final answer
    x = 21,640.58

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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.