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Finding the Fourth Proportional to 28,079.92, 42,128.99 and 8,358.65

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Solution

The fourth proportional to 28,079.92, 42,128.99 and 8,358.65 is: 12,540.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,079.92 : 42,128.99 = 8,358.65 : x
  2. Step 2: Convert to fraction form
    28,079.92/42,128.99 = 8,358.65/x
  3. Step 3: Cross multiply
    28,079.92x = 42,128.99 × 8,358.65
  4. Step 4: Simplify right side
    28,079.92x = 352,141,261.17
  5. Step 5: Solve for x
    x = 352,141,261.17/28,079.92
  6. Step 6: Final answer
    x = 12,540.68

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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.