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Finding the Fourth Proportional to 1,126.34, 1,687.80 and 763.46

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Solution

The fourth proportional to 1,126.34, 1,687.80 and 763.46 is: 1,144.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.34 : 1,687.80 = 763.46 : x
  2. Step 2: Convert to fraction form
    1,126.34/1,687.80 = 763.46/x
  3. Step 3: Cross multiply
    1,126.34x = 1,687.80 × 763.46
  4. Step 4: Simplify right side
    1,126.34x = 1,288,567.79
  5. Step 5: Solve for x
    x = 1,288,567.79/1,126.34
  6. Step 6: Final answer
    x = 1,144.03

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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.