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Finding the Fourth Proportional to 487.38, 730.98 and 145.38

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Solution

The fourth proportional to 487.38, 730.98 and 145.38 is: 218.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.38 : 730.98 = 145.38 : x
  2. Step 2: Convert to fraction form
    487.38/730.98 = 145.38/x
  3. Step 3: Cross multiply
    487.38x = 730.98 × 145.38
  4. Step 4: Simplify right side
    487.38x = 106,269.87
  5. Step 5: Solve for x
    x = 106,269.87/487.38
  6. Step 6: Final answer
    x = 218.04

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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.