Home / 1,320.39-1,979.85-540.18

Finding the Fourth Proportional to 1,320.39, 1,979.85 and 540.18

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Solution

The fourth proportional to 1,320.39, 1,979.85 and 540.18 is: 809.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.39 : 1,979.85 = 540.18 : x
  2. Step 2: Convert to fraction form
    1,320.39/1,979.85 = 540.18/x
  3. Step 3: Cross multiply
    1,320.39x = 1,979.85 × 540.18
  4. Step 4: Simplify right side
    1,320.39x = 1,069,475.37
  5. Step 5: Solve for x
    x = 1,069,475.37/1,320.39
  6. Step 6: Final answer
    x = 809.97

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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.