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Finding the Fourth Proportional to 318.08, 438.96 and 187.04

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Solution

The fourth proportional to 318.08, 438.96 and 187.04 is: 258.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.08 : 438.96 = 187.04 : x
  2. Step 2: Convert to fraction form
    318.08/438.96 = 187.04/x
  3. Step 3: Cross multiply
    318.08x = 438.96 × 187.04
  4. Step 4: Simplify right side
    318.08x = 82,103.08
  5. Step 5: Solve for x
    x = 82,103.08/318.08
  6. Step 6: Final answer
    x = 258.12

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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.