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Finding the Fourth Proportional to 106.97, 147.87 and 89.39

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Solution

The fourth proportional to 106.97, 147.87 and 89.39 is: 123.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.97 : 147.87 = 89.39 : x
  2. Step 2: Convert to fraction form
    106.97/147.87 = 89.39/x
  3. Step 3: Cross multiply
    106.97x = 147.87 × 89.39
  4. Step 4: Simplify right side
    106.97x = 13,216.91
  5. Step 5: Solve for x
    x = 13,216.91/106.97
  6. Step 6: Final answer
    x = 123.56

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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.