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Finding the Fourth Proportional to 120.58, 180.42 and 74.14

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Solution

The fourth proportional to 120.58, 180.42 and 74.14 is: 110.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.58 : 180.42 = 74.14 : x
  2. Step 2: Convert to fraction form
    120.58/180.42 = 74.14/x
  3. Step 3: Cross multiply
    120.58x = 180.42 × 74.14
  4. Step 4: Simplify right side
    120.58x = 13,376.34
  5. Step 5: Solve for x
    x = 13,376.34/120.58
  6. Step 6: Final answer
    x = 110.93

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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.