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Finding the Fourth Proportional to 120.99, 167.01 and 71.88

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Solution

The fourth proportional to 120.99, 167.01 and 71.88 is: 99.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.99 : 167.01 = 71.88 : x
  2. Step 2: Convert to fraction form
    120.99/167.01 = 71.88/x
  3. Step 3: Cross multiply
    120.99x = 167.01 × 71.88
  4. Step 4: Simplify right side
    120.99x = 12,004.68
  5. Step 5: Solve for x
    x = 12,004.68/120.99
  6. Step 6: Final answer
    x = 99.22

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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.