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Finding the Fourth Proportional to 1,319.90, 1,979.84 and 395.45

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Solution

The fourth proportional to 1,319.90, 1,979.84 and 395.45 is: 593.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.90 : 1,979.84 = 395.45 : x
  2. Step 2: Convert to fraction form
    1,319.90/1,979.84 = 395.45/x
  3. Step 3: Cross multiply
    1,319.90x = 1,979.84 × 395.45
  4. Step 4: Simplify right side
    1,319.90x = 782,930.70
  5. Step 5: Solve for x
    x = 782,930.70/1,319.90
  6. Step 6: Final answer
    x = 593.18

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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.