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Finding the Fourth Proportional to 71.13, 106.55 and 66.00

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Solution

The fourth proportional to 71.13, 106.55 and 66.00 is: 98.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.13 : 106.55 = 66.00 : x
  2. Step 2: Convert to fraction form
    71.13/106.55 = 66.00/x
  3. Step 3: Cross multiply
    71.13x = 106.55 × 66.00
  4. Step 4: Simplify right side
    71.13x = 7,032.40
  5. Step 5: Solve for x
    x = 7,032.40/71.13
  6. Step 6: Final answer
    x = 98.87

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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.