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Finding the Fourth Proportional to 318.17, 439.06 and 187.18

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Solution

The fourth proportional to 318.17, 439.06 and 187.18 is: 258.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.17 : 439.06 = 187.18 : x
  2. Step 2: Convert to fraction form
    318.17/439.06 = 187.18/x
  3. Step 3: Cross multiply
    318.17x = 439.06 × 187.18
  4. Step 4: Simplify right side
    318.17x = 82,181.52
  5. Step 5: Solve for x
    x = 82,181.52/318.17
  6. Step 6: Final answer
    x = 258.29

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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.