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Finding the Fourth Proportional to 71.24, 106.42 and 55.16

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Solution

The fourth proportional to 71.24, 106.42 and 55.16 is: 82.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.24 : 106.42 = 55.16 : x
  2. Step 2: Convert to fraction form
    71.24/106.42 = 55.16/x
  3. Step 3: Cross multiply
    71.24x = 106.42 × 55.16
  4. Step 4: Simplify right side
    71.24x = 5,870.13
  5. Step 5: Solve for x
    x = 5,870.13/71.24
  6. Step 6: Final answer
    x = 82.40

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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.