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Finding the Fourth Proportional to 119.23, 178.63 and 86.56

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Solution

The fourth proportional to 119.23, 178.63 and 86.56 is: 129.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.23 : 178.63 = 86.56 : x
  2. Step 2: Convert to fraction form
    119.23/178.63 = 86.56/x
  3. Step 3: Cross multiply
    119.23x = 178.63 × 86.56
  4. Step 4: Simplify right side
    119.23x = 15,462.21
  5. Step 5: Solve for x
    x = 15,462.21/119.23
  6. Step 6: Final answer
    x = 129.68

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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.