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Finding the Fourth Proportional to 2,770.15, 4,154.38 and 920.78

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Solution

The fourth proportional to 2,770.15, 4,154.38 and 920.78 is: 1,380.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,770.15 : 4,154.38 = 920.78 : x
  2. Step 2: Convert to fraction form
    2,770.15/4,154.38 = 920.78/x
  3. Step 3: Cross multiply
    2,770.15x = 4,154.38 × 920.78
  4. Step 4: Simplify right side
    2,770.15x = 3,825,270.02
  5. Step 5: Solve for x
    x = 3,825,270.02/2,770.15
  6. Step 6: Final answer
    x = 1,380.89

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1.5x scale

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.