Home / 1,319.60-1,979.40-395.07

Finding the Fourth Proportional to 1,319.60, 1,979.40 and 395.07

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Solution

The fourth proportional to 1,319.60, 1,979.40 and 395.07 is: 592.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.60 : 1,979.40 = 395.07 : x
  2. Step 2: Convert to fraction form
    1,319.60/1,979.40 = 395.07/x
  3. Step 3: Cross multiply
    1,319.60x = 1,979.40 × 395.07
  4. Step 4: Simplify right side
    1,319.60x = 782,001.56
  5. Step 5: Solve for x
    x = 782,001.56/1,319.60
  6. Step 6: Final answer
    x = 592.61

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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.