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Finding the Fourth Proportional to 1,368.90, 2,053.24 and 819.85

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Solution

The fourth proportional to 1,368.90, 2,053.24 and 819.85 is: 1,229.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,368.90 : 2,053.24 = 819.85 : x
  2. Step 2: Convert to fraction form
    1,368.90/2,053.24 = 819.85/x
  3. Step 3: Cross multiply
    1,368.90x = 2,053.24 × 819.85
  4. Step 4: Simplify right side
    1,368.90x = 1,683,348.81
  5. Step 5: Solve for x
    x = 1,683,348.81/1,368.90
  6. Step 6: Final answer
    x = 1,229.71

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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.