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Finding the Fourth Proportional to 318.65, 439.70 and 178.76

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Solution

The fourth proportional to 318.65, 439.70 and 178.76 is: 246.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.65 : 439.70 = 178.76 : x
  2. Step 2: Convert to fraction form
    318.65/439.70 = 178.76/x
  3. Step 3: Cross multiply
    318.65x = 439.70 × 178.76
  4. Step 4: Simplify right side
    318.65x = 78,598.57
  5. Step 5: Solve for x
    x = 78,598.57/318.65
  6. Step 6: Final answer
    x = 246.66

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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.