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Finding the Fourth Proportional to 991.05, 1,366.89 and 641.13

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Solution

The fourth proportional to 991.05, 1,366.89 and 641.13 is: 884.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.05 : 1,366.89 = 641.13 : x
  2. Step 2: Convert to fraction form
    991.05/1,366.89 = 641.13/x
  3. Step 3: Cross multiply
    991.05x = 1,366.89 × 641.13
  4. Step 4: Simplify right side
    991.05x = 876,354.19
  5. Step 5: Solve for x
    x = 876,354.19/991.05
  6. Step 6: Final answer
    x = 884.27

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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.