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Finding the Fourth Proportional to 853.32, 1,278.86 and 441.40

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Solution

The fourth proportional to 853.32, 1,278.86 and 441.40 is: 661.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.32 : 1,278.86 = 441.40 : x
  2. Step 2: Convert to fraction form
    853.32/1,278.86 = 441.40/x
  3. Step 3: Cross multiply
    853.32x = 1,278.86 × 441.40
  4. Step 4: Simplify right side
    853.32x = 564,488.80
  5. Step 5: Solve for x
    x = 564,488.80/853.32
  6. Step 6: Final answer
    x = 661.52

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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.