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Finding the Fourth Proportional to 1,319.84, 1,979.41 and 395.15

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Solution

The fourth proportional to 1,319.84, 1,979.41 and 395.15 is: 592.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.84 : 1,979.41 = 395.15 : x
  2. Step 2: Convert to fraction form
    1,319.84/1,979.41 = 395.15/x
  3. Step 3: Cross multiply
    1,319.84x = 1,979.41 × 395.15
  4. Step 4: Simplify right side
    1,319.84x = 782,163.86
  5. Step 5: Solve for x
    x = 782,163.86/1,319.84
  6. Step 6: Final answer
    x = 592.62

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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.