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Finding the Fourth Proportional to 778.10, 1,073.73 and 716.18

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Solution

The fourth proportional to 778.10, 1,073.73 and 716.18 is: 988.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.10 : 1,073.73 = 716.18 : x
  2. Step 2: Convert to fraction form
    778.10/1,073.73 = 716.18/x
  3. Step 3: Cross multiply
    778.10x = 1,073.73 × 716.18
  4. Step 4: Simplify right side
    778.10x = 768,983.95
  5. Step 5: Solve for x
    x = 768,983.95/778.10
  6. Step 6: Final answer
    x = 988.28

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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.