Home / 1,320.65-1,979.25-539.76

Finding the Fourth Proportional to 1,320.65, 1,979.25 and 539.76

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Solution

The fourth proportional to 1,320.65, 1,979.25 and 539.76 is: 808.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.65 : 1,979.25 = 539.76 : x
  2. Step 2: Convert to fraction form
    1,320.65/1,979.25 = 539.76/x
  3. Step 3: Cross multiply
    1,320.65x = 1,979.25 × 539.76
  4. Step 4: Simplify right side
    1,320.65x = 1,068,311.71
  5. Step 5: Solve for x
    x = 1,068,311.71/1,320.65
  6. Step 6: Final answer
    x = 808.93

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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.