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Finding the Fourth Proportional to 1,131.26, 1,561.16 and 633.88

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Solution

The fourth proportional to 1,131.26, 1,561.16 and 633.88 is: 874.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.26 : 1,561.16 = 633.88 : x
  2. Step 2: Convert to fraction form
    1,131.26/1,561.16 = 633.88/x
  3. Step 3: Cross multiply
    1,131.26x = 1,561.16 × 633.88
  4. Step 4: Simplify right side
    1,131.26x = 989,592.00
  5. Step 5: Solve for x
    x = 989,592.00/1,131.26
  6. Step 6: Final answer
    x = 874.77

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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.