Home / 1,319.76-1,979.37-395.28

Finding the Fourth Proportional to 1,319.76, 1,979.37 and 395.28

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Solution

The fourth proportional to 1,319.76, 1,979.37 and 395.28 is: 592.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.76 : 1,979.37 = 395.28 : x
  2. Step 2: Convert to fraction form
    1,319.76/1,979.37 = 395.28/x
  3. Step 3: Cross multiply
    1,319.76x = 1,979.37 × 395.28
  4. Step 4: Simplify right side
    1,319.76x = 782,405.37
  5. Step 5: Solve for x
    x = 782,405.37/1,319.76
  6. Step 6: Final answer
    x = 592.84

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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.