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Finding the Fourth Proportional to 1,372.68, 1,894.23 and 813.78

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Solution

The fourth proportional to 1,372.68, 1,894.23 and 813.78 is: 1,122.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,372.68 : 1,894.23 = 813.78 : x
  2. Step 2: Convert to fraction form
    1,372.68/1,894.23 = 813.78/x
  3. Step 3: Cross multiply
    1,372.68x = 1,894.23 × 813.78
  4. Step 4: Simplify right side
    1,372.68x = 1,541,486.49
  5. Step 5: Solve for x
    x = 1,541,486.49/1,372.68
  6. Step 6: Final answer
    x = 1,122.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.