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Finding the Fourth Proportional to 487.71, 731.55 and 198.95

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Solution

The fourth proportional to 487.71, 731.55 and 198.95 is: 298.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.71 : 731.55 = 198.95 : x
  2. Step 2: Convert to fraction form
    487.71/731.55 = 198.95/x
  3. Step 3: Cross multiply
    487.71x = 731.55 × 198.95
  4. Step 4: Simplify right side
    487.71x = 145,538.21
  5. Step 5: Solve for x
    x = 145,538.21/487.71
  6. Step 6: Final answer
    x = 298.41

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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.