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Finding the Fourth Proportional to 123.49, 170.23 and 103.89

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Solution

The fourth proportional to 123.49, 170.23 and 103.89 is: 143.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.49 : 170.23 = 103.89 : x
  2. Step 2: Convert to fraction form
    123.49/170.23 = 103.89/x
  3. Step 3: Cross multiply
    123.49x = 170.23 × 103.89
  4. Step 4: Simplify right side
    123.49x = 17,685.19
  5. Step 5: Solve for x
    x = 17,685.19/123.49
  6. Step 6: Final answer
    x = 143.21

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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.