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Finding the Fourth Proportional to 178.13, 245.67 and 119.90

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Solution

The fourth proportional to 178.13, 245.67 and 119.90 is: 165.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.13 : 245.67 = 119.90 : x
  2. Step 2: Convert to fraction form
    178.13/245.67 = 119.90/x
  3. Step 3: Cross multiply
    178.13x = 245.67 × 119.90
  4. Step 4: Simplify right side
    178.13x = 29,455.83
  5. Step 5: Solve for x
    x = 29,455.83/178.13
  6. Step 6: Final answer
    x = 165.36

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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.