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Finding the Fourth Proportional to 2,770.55, 4,155.90 and 690.54

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Solution

The fourth proportional to 2,770.55, 4,155.90 and 690.54 is: 1,035.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,770.55 : 4,155.90 = 690.54 : x
  2. Step 2: Convert to fraction form
    2,770.55/4,155.90 = 690.54/x
  3. Step 3: Cross multiply
    2,770.55x = 4,155.90 × 690.54
  4. Step 4: Simplify right side
    2,770.55x = 2,869,815.19
  5. Step 5: Solve for x
    x = 2,869,815.19/2,770.55
  6. Step 6: Final answer
    x = 1,035.83

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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.