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Finding the Fourth Proportional to 28,487.76, 42,731.64 and 7,711.26

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Solution

The fourth proportional to 28,487.76, 42,731.64 and 7,711.26 is: 11,566.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,487.76 : 42,731.64 = 7,711.26 : x
  2. Step 2: Convert to fraction form
    28,487.76/42,731.64 = 7,711.26/x
  3. Step 3: Cross multiply
    28,487.76x = 42,731.64 × 7,711.26
  4. Step 4: Simplify right side
    28,487.76x = 329,514,786.27
  5. Step 5: Solve for x
    x = 329,514,786.27/28,487.76
  6. Step 6: Final answer
    x = 11,566.89

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Similar ratio
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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.