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Finding the Fourth Proportional to 778.55, 1,167.38 and 624.76

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Solution

The fourth proportional to 778.55, 1,167.38 and 624.76 is: 936.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.55 : 1,167.38 = 624.76 : x
  2. Step 2: Convert to fraction form
    778.55/1,167.38 = 624.76/x
  3. Step 3: Cross multiply
    778.55x = 1,167.38 × 624.76
  4. Step 4: Simplify right side
    778.55x = 729,335.20
  5. Step 5: Solve for x
    x = 729,335.20/778.55
  6. Step 6: Final answer
    x = 936.79

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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.