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Finding the Fourth Proportional to 123.84, 170.84 and 74.70

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Solution

The fourth proportional to 123.84, 170.84 and 74.70 is: 103.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.84 : 170.84 = 74.70 : x
  2. Step 2: Convert to fraction form
    123.84/170.84 = 74.70/x
  3. Step 3: Cross multiply
    123.84x = 170.84 × 74.70
  4. Step 4: Simplify right side
    123.84x = 12,761.75
  5. Step 5: Solve for x
    x = 12,761.75/123.84
  6. Step 6: Final answer
    x = 103.05

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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.