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Finding the Fourth Proportional to 950.80, 1,311.60 and 618.88

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Solution

The fourth proportional to 950.80, 1,311.60 and 618.88 is: 853.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    950.80 : 1,311.60 = 618.88 : x
  2. Step 2: Convert to fraction form
    950.80/1,311.60 = 618.88/x
  3. Step 3: Cross multiply
    950.80x = 1,311.60 × 618.88
  4. Step 4: Simplify right side
    950.80x = 811,723.01
  5. Step 5: Solve for x
    x = 811,723.01/950.80
  6. Step 6: Final answer
    x = 853.73

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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.