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Finding the Fourth Proportional to 123.90, 170.95 and 104.31

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Solution

The fourth proportional to 123.90, 170.95 and 104.31 is: 143.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.90 : 170.95 = 104.31 : x
  2. Step 2: Convert to fraction form
    123.90/170.95 = 104.31/x
  3. Step 3: Cross multiply
    123.90x = 170.95 × 104.31
  4. Step 4: Simplify right side
    123.90x = 17,831.79
  5. Step 5: Solve for x
    x = 17,831.79/123.90
  6. Step 6: Final answer
    x = 143.92

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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.