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Finding the Fourth Proportional to 109.52, 163.57 and 86.72

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Solution

The fourth proportional to 109.52, 163.57 and 86.72 is: 129.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.52 : 163.57 = 86.72 : x
  2. Step 2: Convert to fraction form
    109.52/163.57 = 86.72/x
  3. Step 3: Cross multiply
    109.52x = 163.57 × 86.72
  4. Step 4: Simplify right side
    109.52x = 14,184.79
  5. Step 5: Solve for x
    x = 14,184.79/109.52
  6. Step 6: Final answer
    x = 129.52

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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.