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Finding the Fourth Proportional to 778.58, 1,161.49 and 757.40

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Solution

The fourth proportional to 778.58, 1,161.49 and 757.40 is: 1,129.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.58 : 1,161.49 = 757.40 : x
  2. Step 2: Convert to fraction form
    778.58/1,161.49 = 757.40/x
  3. Step 3: Cross multiply
    778.58x = 1,161.49 × 757.40
  4. Step 4: Simplify right side
    778.58x = 879,708.61
  5. Step 5: Solve for x
    x = 879,708.61/778.58
  6. Step 6: Final answer
    x = 1,129.89

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.