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Finding the Fourth Proportional to 178.40, 245.67 and 129.19

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Solution

The fourth proportional to 178.40, 245.67 and 129.19 is: 177.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.40 : 245.67 = 129.19 : x
  2. Step 2: Convert to fraction form
    178.40/245.67 = 129.19/x
  3. Step 3: Cross multiply
    178.40x = 245.67 × 129.19
  4. Step 4: Simplify right side
    178.40x = 31,738.11
  5. Step 5: Solve for x
    x = 31,738.11/178.40
  6. Step 6: Final answer
    x = 177.90

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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.