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Finding the Fourth Proportional to 83.45, 124.58 and 71.84

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Solution

The fourth proportional to 83.45, 124.58 and 71.84 is: 107.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.45 : 124.58 = 71.84 : x
  2. Step 2: Convert to fraction form
    83.45/124.58 = 71.84/x
  3. Step 3: Cross multiply
    83.45x = 124.58 × 71.84
  4. Step 4: Simplify right side
    83.45x = 8,949.83
  5. Step 5: Solve for x
    x = 8,949.83/83.45
  6. Step 6: Final answer
    x = 107.25

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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.