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Finding the Fourth Proportional to 124.25, 171.43 and 105.65

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Solution

The fourth proportional to 124.25, 171.43 and 105.65 is: 145.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.25 : 171.43 = 105.65 : x
  2. Step 2: Convert to fraction form
    124.25/171.43 = 105.65/x
  3. Step 3: Cross multiply
    124.25x = 171.43 × 105.65
  4. Step 4: Simplify right side
    124.25x = 18,111.70
  5. Step 5: Solve for x
    x = 18,111.70/124.25
  6. Step 6: Final answer
    x = 145.77

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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.