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Finding the Fourth Proportional to 1,209.78, 1,814.66 and 344.08

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Solution

The fourth proportional to 1,209.78, 1,814.66 and 344.08 is: 516.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.78 : 1,814.66 = 344.08 : x
  2. Step 2: Convert to fraction form
    1,209.78/1,814.66 = 344.08/x
  3. Step 3: Cross multiply
    1,209.78x = 1,814.66 × 344.08
  4. Step 4: Simplify right side
    1,209.78x = 624,388.21
  5. Step 5: Solve for x
    x = 624,388.21/1,209.78
  6. Step 6: Final answer
    x = 516.12

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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.