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Finding the Fourth Proportional to 862.93, 1,291.90 and 773.90

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Solution

The fourth proportional to 862.93, 1,291.90 and 773.90 is: 1,158.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.93 : 1,291.90 = 773.90 : x
  2. Step 2: Convert to fraction form
    862.93/1,291.90 = 773.90/x
  3. Step 3: Cross multiply
    862.93x = 1,291.90 × 773.90
  4. Step 4: Simplify right side
    862.93x = 999,796.25
  5. Step 5: Solve for x
    x = 999,796.25/862.93
  6. Step 6: Final answer
    x = 1,158.61

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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.