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Finding the Fourth Proportional to 1,131.72, 1,561.80 and 634.35

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Solution

The fourth proportional to 1,131.72, 1,561.80 and 634.35 is: 875.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.72 : 1,561.80 = 634.35 : x
  2. Step 2: Convert to fraction form
    1,131.72/1,561.80 = 634.35/x
  3. Step 3: Cross multiply
    1,131.72x = 1,561.80 × 634.35
  4. Step 4: Simplify right side
    1,131.72x = 990,718.44
  5. Step 5: Solve for x
    x = 990,718.44/1,131.72
  6. Step 6: Final answer
    x = 875.41

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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.