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Finding the Fourth Proportional to 318.08, 477.15 and 135.49

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Solution

The fourth proportional to 318.08, 477.15 and 135.49 is: 203.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.08 : 477.15 = 135.49 : x
  2. Step 2: Convert to fraction form
    318.08/477.15 = 135.49/x
  3. Step 3: Cross multiply
    318.08x = 477.15 × 135.49
  4. Step 4: Simplify right side
    318.08x = 64,648.63
  5. Step 5: Solve for x
    x = 64,648.63/318.08
  6. Step 6: Final answer
    x = 203.25

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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.