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Finding the Fourth Proportional to 1,131.99, 1,562.21 and 634.60

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Solution

The fourth proportional to 1,131.99, 1,562.21 and 634.60 is: 875.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.99 : 1,562.21 = 634.60 : x
  2. Step 2: Convert to fraction form
    1,131.99/1,562.21 = 634.60/x
  3. Step 3: Cross multiply
    1,131.99x = 1,562.21 × 634.60
  4. Step 4: Simplify right side
    1,131.99x = 991,378.47
  5. Step 5: Solve for x
    x = 991,378.47/1,131.99
  6. Step 6: Final answer
    x = 875.78

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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.