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Finding the Fourth Proportional to 487.13, 730.65 and 121.92

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Solution

The fourth proportional to 487.13, 730.65 and 121.92 is: 182.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.13 : 730.65 = 121.92 : x
  2. Step 2: Convert to fraction form
    487.13/730.65 = 121.92/x
  3. Step 3: Cross multiply
    487.13x = 730.65 × 121.92
  4. Step 4: Simplify right side
    487.13x = 89,081.31
  5. Step 5: Solve for x
    x = 89,081.31/487.13
  6. Step 6: Final answer
    x = 182.87

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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.