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Finding the Fourth Proportional to 991.99, 1,368.71 and 633.23

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Solution

The fourth proportional to 991.99, 1,368.71 and 633.23 is: 873.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.99 : 1,368.71 = 633.23 : x
  2. Step 2: Convert to fraction form
    991.99/1,368.71 = 633.23/x
  3. Step 3: Cross multiply
    991.99x = 1,368.71 × 633.23
  4. Step 4: Simplify right side
    991.99x = 866,708.23
  5. Step 5: Solve for x
    x = 866,708.23/991.99
  6. Step 6: Final answer
    x = 873.71

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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.