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Finding the Fourth Proportional to 124.15, 170.97 and 123.78

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Solution

The fourth proportional to 124.15, 170.97 and 123.78 is: 170.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.15 : 170.97 = 123.78 : x
  2. Step 2: Convert to fraction form
    124.15/170.97 = 123.78/x
  3. Step 3: Cross multiply
    124.15x = 170.97 × 123.78
  4. Step 4: Simplify right side
    124.15x = 21,162.24
  5. Step 5: Solve for x
    x = 21,162.24/124.15
  6. Step 6: Final answer
    x = 170.46

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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.