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Finding the Fourth Proportional to 789.59, 1,178.40 and 771.14

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Solution

The fourth proportional to 789.59, 1,178.40 and 771.14 is: 1,150.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.59 : 1,178.40 = 771.14 : x
  2. Step 2: Convert to fraction form
    789.59/1,178.40 = 771.14/x
  3. Step 3: Cross multiply
    789.59x = 1,178.40 × 771.14
  4. Step 4: Simplify right side
    789.59x = 908,705.48
  5. Step 5: Solve for x
    x = 908,705.48/789.59
  6. Step 6: Final answer
    x = 1,150.86

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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.