Home / 1,319.60-1,979.38-395.15

Finding the Fourth Proportional to 1,319.60, 1,979.38 and 395.15

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Solution

The fourth proportional to 1,319.60, 1,979.38 and 395.15 is: 592.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.60 : 1,979.38 = 395.15 : x
  2. Step 2: Convert to fraction form
    1,319.60/1,979.38 = 395.15/x
  3. Step 3: Cross multiply
    1,319.60x = 1,979.38 × 395.15
  4. Step 4: Simplify right side
    1,319.60x = 782,152.01
  5. Step 5: Solve for x
    x = 782,152.01/1,319.60
  6. Step 6: Final answer
    x = 592.72

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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.