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Finding the Fourth Proportional to 124.12, 170.96 and 103.36

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Solution

The fourth proportional to 124.12, 170.96 and 103.36 is: 142.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.12 : 170.96 = 103.36 : x
  2. Step 2: Convert to fraction form
    124.12/170.96 = 103.36/x
  3. Step 3: Cross multiply
    124.12x = 170.96 × 103.36
  4. Step 4: Simplify right side
    124.12x = 17,670.43
  5. Step 5: Solve for x
    x = 17,670.43/124.12
  6. Step 6: Final answer
    x = 142.37

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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.