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Finding the Fourth Proportional to 478.28, 717.60 and 189.92

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Solution

The fourth proportional to 478.28, 717.60 and 189.92 is: 284.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.28 : 717.60 = 189.92 : x
  2. Step 2: Convert to fraction form
    478.28/717.60 = 189.92/x
  3. Step 3: Cross multiply
    478.28x = 717.60 × 189.92
  4. Step 4: Simplify right side
    478.28x = 136,286.59
  5. Step 5: Solve for x
    x = 136,286.59/478.28
  6. Step 6: Final answer
    x = 284.95

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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.