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Finding the Fourth Proportional to 217.76, 325.12 and 187.20

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Solution

The fourth proportional to 217.76, 325.12 and 187.20 is: 279.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.76 : 325.12 = 187.20 : x
  2. Step 2: Convert to fraction form
    217.76/325.12 = 187.20/x
  3. Step 3: Cross multiply
    217.76x = 325.12 × 187.20
  4. Step 4: Simplify right side
    217.76x = 60,862.46
  5. Step 5: Solve for x
    x = 60,862.46/217.76
  6. Step 6: Final answer
    x = 279.49

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.