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Finding the Fourth Proportional to 487.53, 731.28 and 198.75

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Solution

The fourth proportional to 487.53, 731.28 and 198.75 is: 298.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.53 : 731.28 = 198.75 : x
  2. Step 2: Convert to fraction form
    487.53/731.28 = 198.75/x
  3. Step 3: Cross multiply
    487.53x = 731.28 × 198.75
  4. Step 4: Simplify right side
    487.53x = 145,341.90
  5. Step 5: Solve for x
    x = 145,341.90/487.53
  6. Step 6: Final answer
    x = 298.12

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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.