Home / 1,211.20-1,671.46-769.55

Finding the Fourth Proportional to 1,211.20, 1,671.46 and 769.55

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Solution

The fourth proportional to 1,211.20, 1,671.46 and 769.55 is: 1,061.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.20 : 1,671.46 = 769.55 : x
  2. Step 2: Convert to fraction form
    1,211.20/1,671.46 = 769.55/x
  3. Step 3: Cross multiply
    1,211.20x = 1,671.46 × 769.55
  4. Step 4: Simplify right side
    1,211.20x = 1,286,273.33
  5. Step 5: Solve for x
    x = 1,286,273.33/1,211.20
  6. Step 6: Final answer
    x = 1,061.98

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.