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Finding the Fourth Proportional to 1,317.80, 1,976.55 and 343.88

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Solution

The fourth proportional to 1,317.80, 1,976.55 and 343.88 is: 515.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.80 : 1,976.55 = 343.88 : x
  2. Step 2: Convert to fraction form
    1,317.80/1,976.55 = 343.88/x
  3. Step 3: Cross multiply
    1,317.80x = 1,976.55 × 343.88
  4. Step 4: Simplify right side
    1,317.80x = 679,692.25
  5. Step 5: Solve for x
    x = 679,692.25/1,317.80
  6. Step 6: Final answer
    x = 515.78

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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.