Home / 1,319.69-1,979.67-395.15

Finding the Fourth Proportional to 1,319.69, 1,979.67 and 395.15

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Solution

The fourth proportional to 1,319.69, 1,979.67 and 395.15 is: 592.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.69 : 1,979.67 = 395.15 : x
  2. Step 2: Convert to fraction form
    1,319.69/1,979.67 = 395.15/x
  3. Step 3: Cross multiply
    1,319.69x = 1,979.67 × 395.15
  4. Step 4: Simplify right side
    1,319.69x = 782,258.18
  5. Step 5: Solve for x
    x = 782,258.18/1,319.69
  6. Step 6: Final answer
    x = 592.76

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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.