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Finding the Fourth Proportional to 123.74, 170.69 and 84.38

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Solution

The fourth proportional to 123.74, 170.69 and 84.38 is: 116.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.74 : 170.69 = 84.38 : x
  2. Step 2: Convert to fraction form
    123.74/170.69 = 84.38/x
  3. Step 3: Cross multiply
    123.74x = 170.69 × 84.38
  4. Step 4: Simplify right side
    123.74x = 14,402.82
  5. Step 5: Solve for x
    x = 14,402.82/123.74
  6. Step 6: Final answer
    x = 116.40

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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.