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Finding the Fourth Proportional to 1,209.42, 1,814.54 and 819.81

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Solution

The fourth proportional to 1,209.42, 1,814.54 and 819.81 is: 1,229.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.42 : 1,814.54 = 819.81 : x
  2. Step 2: Convert to fraction form
    1,209.42/1,814.54 = 819.81/x
  3. Step 3: Cross multiply
    1,209.42x = 1,814.54 × 819.81
  4. Step 4: Simplify right side
    1,209.42x = 1,487,573.94
  5. Step 5: Solve for x
    x = 1,487,573.94/1,209.42
  6. Step 6: Final answer
    x = 1,229.99

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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.