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Finding the Fourth Proportional to 318.95, 478.38 and 136.39

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Solution

The fourth proportional to 318.95, 478.38 and 136.39 is: 204.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.95 : 478.38 = 136.39 : x
  2. Step 2: Convert to fraction form
    318.95/478.38 = 136.39/x
  3. Step 3: Cross multiply
    318.95x = 478.38 × 136.39
  4. Step 4: Simplify right side
    318.95x = 65,246.25
  5. Step 5: Solve for x
    x = 65,246.25/318.95
  6. Step 6: Final answer
    x = 204.57

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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.