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Finding the Fourth Proportional to 28,099.48, 42,149.22 and 8,391.88

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Solution

The fourth proportional to 28,099.48, 42,149.22 and 8,391.88 is: 12,587.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,099.48 : 42,149.22 = 8,391.88 : x
  2. Step 2: Convert to fraction form
    28,099.48/42,149.22 = 8,391.88/x
  3. Step 3: Cross multiply
    28,099.48x = 42,149.22 × 8,391.88
  4. Step 4: Simplify right side
    28,099.48x = 353,711,196.33
  5. Step 5: Solve for x
    x = 353,711,196.33/28,099.48
  6. Step 6: Final answer
    x = 12,587.82

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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.