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Finding the Fourth Proportional to 318.35, 439.20 and 187.35

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Solution

The fourth proportional to 318.35, 439.20 and 187.35 is: 258.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.35 : 439.20 = 187.35 : x
  2. Step 2: Convert to fraction form
    318.35/439.20 = 187.35/x
  3. Step 3: Cross multiply
    318.35x = 439.20 × 187.35
  4. Step 4: Simplify right side
    318.35x = 82,284.12
  5. Step 5: Solve for x
    x = 82,284.12/318.35
  6. Step 6: Final answer
    x = 258.47

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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.