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Finding the Fourth Proportional to 487.80, 731.69 and 122.59

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Solution

The fourth proportional to 487.80, 731.69 and 122.59 is: 183.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.80 : 731.69 = 122.59 : x
  2. Step 2: Convert to fraction form
    487.80/731.69 = 122.59/x
  3. Step 3: Cross multiply
    487.80x = 731.69 × 122.59
  4. Step 4: Simplify right side
    487.80x = 89,693.61
  5. Step 5: Solve for x
    x = 89,693.61/487.80
  6. Step 6: Final answer
    x = 183.87

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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.