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Finding the Fourth Proportional to 939.78, 1,295.92 and 624.94

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Solution

The fourth proportional to 939.78, 1,295.92 and 624.94 is: 861.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.78 : 1,295.92 = 624.94 : x
  2. Step 2: Convert to fraction form
    939.78/1,295.92 = 624.94/x
  3. Step 3: Cross multiply
    939.78x = 1,295.92 × 624.94
  4. Step 4: Simplify right side
    939.78x = 809,872.24
  5. Step 5: Solve for x
    x = 809,872.24/939.78
  6. Step 6: Final answer
    x = 861.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.