Home / 1,319.34-1,979.29-394.90

Finding the Fourth Proportional to 1,319.34, 1,979.29 and 394.90

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Solution

The fourth proportional to 1,319.34, 1,979.29 and 394.90 is: 592.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.34 : 1,979.29 = 394.90 : x
  2. Step 2: Convert to fraction form
    1,319.34/1,979.29 = 394.90/x
  3. Step 3: Cross multiply
    1,319.34x = 1,979.29 × 394.90
  4. Step 4: Simplify right side
    1,319.34x = 781,620.51
  5. Step 5: Solve for x
    x = 781,620.51/1,319.34
  6. Step 6: Final answer
    x = 592.43

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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.