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Finding the Fourth Proportional to 125.10, 171.54 and 120.76

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Solution

The fourth proportional to 125.10, 171.54 and 120.76 is: 165.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.10 : 171.54 = 120.76 : x
  2. Step 2: Convert to fraction form
    125.10/171.54 = 120.76/x
  3. Step 3: Cross multiply
    125.10x = 171.54 × 120.76
  4. Step 4: Simplify right side
    125.10x = 20,714.74
  5. Step 5: Solve for x
    x = 20,714.74/125.10
  6. Step 6: Final answer
    x = 165.59

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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.