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Finding the Fourth Proportional to 1,380.88, 2,069.97 and 763.30

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Solution

The fourth proportional to 1,380.88, 2,069.97 and 763.30 is: 1,144.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.88 : 2,069.97 = 763.30 : x
  2. Step 2: Convert to fraction form
    1,380.88/2,069.97 = 763.30/x
  3. Step 3: Cross multiply
    1,380.88x = 2,069.97 × 763.30
  4. Step 4: Simplify right side
    1,380.88x = 1,580,008.10
  5. Step 5: Solve for x
    x = 1,580,008.10/1,380.88
  6. Step 6: Final answer
    x = 1,144.20

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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.