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Finding the Fourth Proportional to 216.88, 325.38 and 86.98

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Solution

The fourth proportional to 216.88, 325.38 and 86.98 is: 130.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.88 : 325.38 = 86.98 : x
  2. Step 2: Convert to fraction form
    216.88/325.38 = 86.98/x
  3. Step 3: Cross multiply
    216.88x = 325.38 × 86.98
  4. Step 4: Simplify right side
    216.88x = 28,301.55
  5. Step 5: Solve for x
    x = 28,301.55/216.88
  6. Step 6: Final answer
    x = 130.49

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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.