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Finding the Fourth Proportional to 1,359.19, 2,039.65 and 579.19

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Solution

The fourth proportional to 1,359.19, 2,039.65 and 579.19 is: 869.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,359.19 : 2,039.65 = 579.19 : x
  2. Step 2: Convert to fraction form
    1,359.19/2,039.65 = 579.19/x
  3. Step 3: Cross multiply
    1,359.19x = 2,039.65 × 579.19
  4. Step 4: Simplify right side
    1,359.19x = 1,181,347.09
  5. Step 5: Solve for x
    x = 1,181,347.09/1,359.19
  6. Step 6: Final answer
    x = 869.16

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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.