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Finding the Fourth Proportional to 1,319.90, 1,979.85 and 832.28

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Solution

The fourth proportional to 1,319.90, 1,979.85 and 832.28 is: 1,248.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.90 : 1,979.85 = 832.28 : x
  2. Step 2: Convert to fraction form
    1,319.90/1,979.85 = 832.28/x
  3. Step 3: Cross multiply
    1,319.90x = 1,979.85 × 832.28
  4. Step 4: Simplify right side
    1,319.90x = 1,647,789.56
  5. Step 5: Solve for x
    x = 1,647,789.56/1,319.90
  6. Step 6: Final answer
    x = 1,248.42

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Similar ratio
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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.