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Finding the Fourth Proportional to 487.63, 731.85 and 213.85

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Solution

The fourth proportional to 487.63, 731.85 and 213.85 is: 320.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.63 : 731.85 = 213.85 : x
  2. Step 2: Convert to fraction form
    487.63/731.85 = 213.85/x
  3. Step 3: Cross multiply
    487.63x = 731.85 × 213.85
  4. Step 4: Simplify right side
    487.63x = 156,506.12
  5. Step 5: Solve for x
    x = 156,506.12/487.63
  6. Step 6: Final answer
    x = 320.95

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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.