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Finding the Fourth Proportional to 318.60, 439.69 and 185.87

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Solution

The fourth proportional to 318.60, 439.69 and 185.87 is: 256.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.60 : 439.69 = 185.87 : x
  2. Step 2: Convert to fraction form
    318.60/439.69 = 185.87/x
  3. Step 3: Cross multiply
    318.60x = 439.69 × 185.87
  4. Step 4: Simplify right side
    318.60x = 81,725.18
  5. Step 5: Solve for x
    x = 81,725.18/318.60
  6. Step 6: Final answer
    x = 256.51

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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.