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Finding the Fourth Proportional to 124.11, 171.23 and 77.45

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Solution

The fourth proportional to 124.11, 171.23 and 77.45 is: 106.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.11 : 171.23 = 77.45 : x
  2. Step 2: Convert to fraction form
    124.11/171.23 = 77.45/x
  3. Step 3: Cross multiply
    124.11x = 171.23 × 77.45
  4. Step 4: Simplify right side
    124.11x = 13,260.52
  5. Step 5: Solve for x
    x = 13,260.52/124.11
  6. Step 6: Final answer
    x = 106.84

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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.