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Finding the Fourth Proportional to 125.65, 172.66 and 102.28

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Solution

The fourth proportional to 125.65, 172.66 and 102.28 is: 140.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.65 : 172.66 = 102.28 : x
  2. Step 2: Convert to fraction form
    125.65/172.66 = 102.28/x
  3. Step 3: Cross multiply
    125.65x = 172.66 × 102.28
  4. Step 4: Simplify right side
    125.65x = 17,659.15
  5. Step 5: Solve for x
    x = 17,659.15/125.65
  6. Step 6: Final answer
    x = 140.54

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.