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Finding the Fourth Proportional to 1,131.48, 1,561.46 and 634.11

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Solution

The fourth proportional to 1,131.48, 1,561.46 and 634.11 is: 875.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.48 : 1,561.46 = 634.11 : x
  2. Step 2: Convert to fraction form
    1,131.48/1,561.46 = 634.11/x
  3. Step 3: Cross multiply
    1,131.48x = 1,561.46 × 634.11
  4. Step 4: Simplify right side
    1,131.48x = 990,137.40
  5. Step 5: Solve for x
    x = 990,137.40/1,131.48
  6. Step 6: Final answer
    x = 875.08

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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.