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Finding the Fourth Proportional to 318.58, 439.66 and 185.79

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Solution

The fourth proportional to 318.58, 439.66 and 185.79 is: 256.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.58 : 439.66 = 185.79 : x
  2. Step 2: Convert to fraction form
    318.58/439.66 = 185.79/x
  3. Step 3: Cross multiply
    318.58x = 439.66 × 185.79
  4. Step 4: Simplify right side
    318.58x = 81,686.31
  5. Step 5: Solve for x
    x = 81,686.31/318.58
  6. Step 6: Final answer
    x = 256.41

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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.