Home / 1,320.58-1,979.95-579.83

Finding the Fourth Proportional to 1,320.58, 1,979.95 and 579.83

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Solution

The fourth proportional to 1,320.58, 1,979.95 and 579.83 is: 869.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.58 : 1,979.95 = 579.83 : x
  2. Step 2: Convert to fraction form
    1,320.58/1,979.95 = 579.83/x
  3. Step 3: Cross multiply
    1,320.58x = 1,979.95 × 579.83
  4. Step 4: Simplify right side
    1,320.58x = 1,148,034.41
  5. Step 5: Solve for x
    x = 1,148,034.41/1,320.58
  6. Step 6: Final answer
    x = 869.34

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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.