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Finding the Fourth Proportional to 1,209.38, 1,814.13 and 343.76

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Solution

The fourth proportional to 1,209.38, 1,814.13 and 343.76 is: 515.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.38 : 1,814.13 = 343.76 : x
  2. Step 2: Convert to fraction form
    1,209.38/1,814.13 = 343.76/x
  3. Step 3: Cross multiply
    1,209.38x = 1,814.13 × 343.76
  4. Step 4: Simplify right side
    1,209.38x = 623,616.26
  5. Step 5: Solve for x
    x = 623,616.26/1,209.38
  6. Step 6: Final answer
    x = 515.65

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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.