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Finding the Fourth Proportional to 106.82, 147.45 and 71.90

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Solution

The fourth proportional to 106.82, 147.45 and 71.90 is: 99.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.82 : 147.45 = 71.90 : x
  2. Step 2: Convert to fraction form
    106.82/147.45 = 71.90/x
  3. Step 3: Cross multiply
    106.82x = 147.45 × 71.90
  4. Step 4: Simplify right side
    106.82x = 10,601.66
  5. Step 5: Solve for x
    x = 10,601.66/106.82
  6. Step 6: Final answer
    x = 99.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.