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Finding the Fourth Proportional to 216.88, 325.16 and 99.71

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Solution

The fourth proportional to 216.88, 325.16 and 99.71 is: 149.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.88 : 325.16 = 99.71 : x
  2. Step 2: Convert to fraction form
    216.88/325.16 = 99.71/x
  3. Step 3: Cross multiply
    216.88x = 325.16 × 99.71
  4. Step 4: Simplify right side
    216.88x = 32,420.82
  5. Step 5: Solve for x
    x = 32,420.82/216.88
  6. Step 6: Final answer
    x = 149.49

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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.