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Finding the Fourth Proportional to 769.90, 1,155.82 and 766.40

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Solution

The fourth proportional to 769.90, 1,155.82 and 766.40 is: 1,150.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.90 : 1,155.82 = 766.40 : x
  2. Step 2: Convert to fraction form
    769.90/1,155.82 = 766.40/x
  3. Step 3: Cross multiply
    769.90x = 1,155.82 × 766.40
  4. Step 4: Simplify right side
    769.90x = 885,820.45
  5. Step 5: Solve for x
    x = 885,820.45/769.90
  6. Step 6: Final answer
    x = 1,150.57

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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.