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Finding the Fourth Proportional to 478.46, 717.78 and 189.86

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Solution

The fourth proportional to 478.46, 717.78 and 189.86 is: 284.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.46 : 717.78 = 189.86 : x
  2. Step 2: Convert to fraction form
    478.46/717.78 = 189.86/x
  3. Step 3: Cross multiply
    478.46x = 717.78 × 189.86
  4. Step 4: Simplify right side
    478.46x = 136,277.71
  5. Step 5: Solve for x
    x = 136,277.71/478.46
  6. Step 6: Final answer
    x = 284.83

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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.