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Finding the Fourth Proportional to 318.56, 439.59 and 187.58

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Solution

The fourth proportional to 318.56, 439.59 and 187.58 is: 258.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.56 : 439.59 = 187.58 : x
  2. Step 2: Convert to fraction form
    318.56/439.59 = 187.58/x
  3. Step 3: Cross multiply
    318.56x = 439.59 × 187.58
  4. Step 4: Simplify right side
    318.56x = 82,458.29
  5. Step 5: Solve for x
    x = 82,458.29/318.56
  6. Step 6: Final answer
    x = 258.85

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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.