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Finding the Fourth Proportional to 1,131.19, 1,561 and 633.88

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Solution

The fourth proportional to 1,131.19, 1,561 and 633.88 is: 874.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.19 : 1,561 = 633.88 : x
  2. Step 2: Convert to fraction form
    1,131.19/1,561 = 633.88/x
  3. Step 3: Cross multiply
    1,131.19x = 1,561 × 633.88
  4. Step 4: Simplify right side
    1,131.19x = 989,486.68
  5. Step 5: Solve for x
    x = 989,486.68/1,131.19
  6. Step 6: Final answer
    x = 874.73

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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.