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Finding the Fourth Proportional to 318.78, 478.13 and 136.16

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Solution

The fourth proportional to 318.78, 478.13 and 136.16 is: 204.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.78 : 478.13 = 136.16 : x
  2. Step 2: Convert to fraction form
    318.78/478.13 = 136.16/x
  3. Step 3: Cross multiply
    318.78x = 478.13 × 136.16
  4. Step 4: Simplify right side
    318.78x = 65,099.11
  5. Step 5: Solve for x
    x = 65,099.11/318.78
  6. Step 6: Final answer
    x = 204.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.