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Finding the Fourth Proportional to 1,381.30, 1,906.20 and 814

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Solution

The fourth proportional to 1,381.30, 1,906.20 and 814 is: 1,123.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.30 : 1,906.20 = 814 : x
  2. Step 2: Convert to fraction form
    1,381.30/1,906.20 = 814/x
  3. Step 3: Cross multiply
    1,381.30x = 1,906.20 × 814
  4. Step 4: Simplify right side
    1,381.30x = 1,551,646.80
  5. Step 5: Solve for x
    x = 1,551,646.80/1,381.30
  6. Step 6: Final answer
    x = 1,123.32

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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.