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Finding the Fourth Proportional to 778.38, 1,167.90 and 388.77

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Solution

The fourth proportional to 778.38, 1,167.90 and 388.77 is: 583.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.38 : 1,167.90 = 388.77 : x
  2. Step 2: Convert to fraction form
    778.38/1,167.90 = 388.77/x
  3. Step 3: Cross multiply
    778.38x = 1,167.90 × 388.77
  4. Step 4: Simplify right side
    778.38x = 454,044.48
  5. Step 5: Solve for x
    x = 454,044.48/778.38
  6. Step 6: Final answer
    x = 583.32

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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.