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Finding the Fourth Proportional to 778.78, 1,167.36 and 649.18

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Solution

The fourth proportional to 778.78, 1,167.36 and 649.18 is: 973.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.78 : 1,167.36 = 649.18 : x
  2. Step 2: Convert to fraction form
    778.78/1,167.36 = 649.18/x
  3. Step 3: Cross multiply
    778.78x = 1,167.36 × 649.18
  4. Step 4: Simplify right side
    778.78x = 757,826.76
  5. Step 5: Solve for x
    x = 757,826.76/778.78
  6. Step 6: Final answer
    x = 973.09

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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.