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Finding the Fourth Proportional to 178.15, 266.60 and 120.31

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Solution

The fourth proportional to 178.15, 266.60 and 120.31 is: 180.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.15 : 266.60 = 120.31 : x
  2. Step 2: Convert to fraction form
    178.15/266.60 = 120.31/x
  3. Step 3: Cross multiply
    178.15x = 266.60 × 120.31
  4. Step 4: Simplify right side
    178.15x = 32,074.65
  5. Step 5: Solve for x
    x = 32,074.65/178.15
  6. Step 6: Final answer
    x = 180.04

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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.