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Finding the Fourth Proportional to 71.11, 106.15 and 61.55

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Solution

The fourth proportional to 71.11, 106.15 and 61.55 is: 91.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.11 : 106.15 = 61.55 : x
  2. Step 2: Convert to fraction form
    71.11/106.15 = 61.55/x
  3. Step 3: Cross multiply
    71.11x = 106.15 × 61.55
  4. Step 4: Simplify right side
    71.11x = 6,533.16
  5. Step 5: Solve for x
    x = 6,533.16/71.11
  6. Step 6: Final answer
    x = 91.87

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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.