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Finding the Fourth Proportional to 991.52, 1,368.72 and 716.96

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Solution

The fourth proportional to 991.52, 1,368.72 and 716.96 is: 989.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.52 : 1,368.72 = 716.96 : x
  2. Step 2: Convert to fraction form
    991.52/1,368.72 = 716.96/x
  3. Step 3: Cross multiply
    991.52x = 1,368.72 × 716.96
  4. Step 4: Simplify right side
    991.52x = 981,317.49
  5. Step 5: Solve for x
    x = 981,317.49/991.52
  6. Step 6: Final answer
    x = 989.71

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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.