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Finding the Fourth Proportional to 124.38, 172.58 and 123.12

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Solution

The fourth proportional to 124.38, 172.58 and 123.12 is: 170.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.38 : 172.58 = 123.12 : x
  2. Step 2: Convert to fraction form
    124.38/172.58 = 123.12/x
  3. Step 3: Cross multiply
    124.38x = 172.58 × 123.12
  4. Step 4: Simplify right side
    124.38x = 21,247.43
  5. Step 5: Solve for x
    x = 21,247.43/124.38
  6. Step 6: Final answer
    x = 170.83

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.