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Finding the Fourth Proportional to 217.14, 325.70 and 87.10

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Solution

The fourth proportional to 217.14, 325.70 and 87.10 is: 130.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.14 : 325.70 = 87.10 : x
  2. Step 2: Convert to fraction form
    217.14/325.70 = 87.10/x
  3. Step 3: Cross multiply
    217.14x = 325.70 × 87.10
  4. Step 4: Simplify right side
    217.14x = 28,368.47
  5. Step 5: Solve for x
    x = 28,368.47/217.14
  6. Step 6: Final answer
    x = 130.65

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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.