Home / 1,319.11-1,979.10-539.28

Finding the Fourth Proportional to 1,319.11, 1,979.10 and 539.28

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Solution

The fourth proportional to 1,319.11, 1,979.10 and 539.28 is: 809.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.11 : 1,979.10 = 539.28 : x
  2. Step 2: Convert to fraction form
    1,319.11/1,979.10 = 539.28/x
  3. Step 3: Cross multiply
    1,319.11x = 1,979.10 × 539.28
  4. Step 4: Simplify right side
    1,319.11x = 1,067,289.05
  5. Step 5: Solve for x
    x = 1,067,289.05/1,319.11
  6. Step 6: Final answer
    x = 809.10

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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.