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Finding the Fourth Proportional to 853.44, 1,278.55 and 487.11

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Solution

The fourth proportional to 853.44, 1,278.55 and 487.11 is: 729.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.44 : 1,278.55 = 487.11 : x
  2. Step 2: Convert to fraction form
    853.44/1,278.55 = 487.11/x
  3. Step 3: Cross multiply
    853.44x = 1,278.55 × 487.11
  4. Step 4: Simplify right side
    853.44x = 622,794.49
  5. Step 5: Solve for x
    x = 622,794.49/853.44
  6. Step 6: Final answer
    x = 729.75

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Double scale
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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.