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Finding the Fourth Proportional to 216.87, 325.08 and 86.87

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Solution

The fourth proportional to 216.87, 325.08 and 86.87 is: 130.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.87 : 325.08 = 86.87 : x
  2. Step 2: Convert to fraction form
    216.87/325.08 = 86.87/x
  3. Step 3: Cross multiply
    216.87x = 325.08 × 86.87
  4. Step 4: Simplify right side
    216.87x = 28,239.70
  5. Step 5: Solve for x
    x = 28,239.70/216.87
  6. Step 6: Final answer
    x = 130.21

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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.