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Finding the Fourth Proportional to 120.61, 180.67 and 71.75

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Solution

The fourth proportional to 120.61, 180.67 and 71.75 is: 107.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.61 : 180.67 = 71.75 : x
  2. Step 2: Convert to fraction form
    120.61/180.67 = 71.75/x
  3. Step 3: Cross multiply
    120.61x = 180.67 × 71.75
  4. Step 4: Simplify right side
    120.61x = 12,963.07
  5. Step 5: Solve for x
    x = 12,963.07/120.61
  6. Step 6: Final answer
    x = 107.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.