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Finding the Fourth Proportional to 318.43, 477.74 and 188.55

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Solution

The fourth proportional to 318.43, 477.74 and 188.55 is: 282.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.43 : 477.74 = 188.55 : x
  2. Step 2: Convert to fraction form
    318.43/477.74 = 188.55/x
  3. Step 3: Cross multiply
    318.43x = 477.74 × 188.55
  4. Step 4: Simplify right side
    318.43x = 90,077.64
  5. Step 5: Solve for x
    x = 90,077.64/318.43
  6. Step 6: Final answer
    x = 282.88

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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.