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Finding the Fourth Proportional to 83.40, 124.50 and 74.28

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Solution

The fourth proportional to 83.40, 124.50 and 74.28 is: 110.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.40 : 124.50 = 74.28 : x
  2. Step 2: Convert to fraction form
    83.40/124.50 = 74.28/x
  3. Step 3: Cross multiply
    83.40x = 124.50 × 74.28
  4. Step 4: Simplify right side
    83.40x = 9,247.86
  5. Step 5: Solve for x
    x = 9,247.86/83.40
  6. Step 6: Final answer
    x = 110.89

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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.