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Finding the Fourth Proportional to 858.80, 1,292.86 and 769.50

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Solution

The fourth proportional to 858.80, 1,292.86 and 769.50 is: 1,158.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.80 : 1,292.86 = 769.50 : x
  2. Step 2: Convert to fraction form
    858.80/1,292.86 = 769.50/x
  3. Step 3: Cross multiply
    858.80x = 1,292.86 × 769.50
  4. Step 4: Simplify right side
    858.80x = 994,856.73
  5. Step 5: Solve for x
    x = 994,856.73/858.80
  6. Step 6: Final answer
    x = 1,158.42

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.