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Finding the Fourth Proportional to 107.97, 148.98 and 71.18

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Solution

The fourth proportional to 107.97, 148.98 and 71.18 is: 98.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.97 : 148.98 = 71.18 : x
  2. Step 2: Convert to fraction form
    107.97/148.98 = 71.18/x
  3. Step 3: Cross multiply
    107.97x = 148.98 × 71.18
  4. Step 4: Simplify right side
    107.97x = 10,603.65
  5. Step 5: Solve for x
    x = 10,603.65/107.97
  6. Step 6: Final answer
    x = 98.21

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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.