Home / 1,319.53-1,979.31-394.87

Finding the Fourth Proportional to 1,319.53, 1,979.31 and 394.87

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Solution

The fourth proportional to 1,319.53, 1,979.31 and 394.87 is: 592.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.53 : 1,979.31 = 394.87 : x
  2. Step 2: Convert to fraction form
    1,319.53/1,979.31 = 394.87/x
  3. Step 3: Cross multiply
    1,319.53x = 1,979.31 × 394.87
  4. Step 4: Simplify right side
    1,319.53x = 781,568.17
  5. Step 5: Solve for x
    x = 781,568.17/1,319.53
  6. Step 6: Final answer
    x = 592.31

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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.