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Finding the Fourth Proportional to 28,609.65, 42,915.50 and 8,887.69

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Solution

The fourth proportional to 28,609.65, 42,915.50 and 8,887.69 is: 13,331.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,609.65 : 42,915.50 = 8,887.69 : x
  2. Step 2: Convert to fraction form
    28,609.65/42,915.50 = 8,887.69/x
  3. Step 3: Cross multiply
    28,609.65x = 42,915.50 × 8,887.69
  4. Step 4: Simplify right side
    28,609.65x = 381,419,660.20
  5. Step 5: Solve for x
    x = 381,419,660.20/28,609.65
  6. Step 6: Final answer
    x = 13,331.85

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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.