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Finding the Fourth Proportional to 109.19, 163.72 and 61.13

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Solution

The fourth proportional to 109.19, 163.72 and 61.13 is: 91.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.19 : 163.72 = 61.13 : x
  2. Step 2: Convert to fraction form
    109.19/163.72 = 61.13/x
  3. Step 3: Cross multiply
    109.19x = 163.72 × 61.13
  4. Step 4: Simplify right side
    109.19x = 10,008.20
  5. Step 5: Solve for x
    x = 10,008.20/109.19
  6. Step 6: Final answer
    x = 91.66

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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.