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Finding the Fourth Proportional to 318.16, 439.15 and 187.21

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Solution

The fourth proportional to 318.16, 439.15 and 187.21 is: 258.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.16 : 439.15 = 187.21 : x
  2. Step 2: Convert to fraction form
    318.16/439.15 = 187.21/x
  3. Step 3: Cross multiply
    318.16x = 439.15 × 187.21
  4. Step 4: Simplify right side
    318.16x = 82,213.27
  5. Step 5: Solve for x
    x = 82,213.27/318.16
  6. Step 6: Final answer
    x = 258.40

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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.