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Finding the Fourth Proportional to 28,046.61, 42,060.81 and 9,321.61

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Solution

The fourth proportional to 28,046.61, 42,060.81 and 9,321.61 is: 13,979.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,046.61 : 42,060.81 = 9,321.61 : x
  2. Step 2: Convert to fraction form
    28,046.61/42,060.81 = 9,321.61/x
  3. Step 3: Cross multiply
    28,046.61x = 42,060.81 × 9,321.61
  4. Step 4: Simplify right side
    28,046.61x = 392,074,467.10
  5. Step 5: Solve for x
    x = 392,074,467.10/28,046.61
  6. Step 6: Final answer
    x = 13,979.39

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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.