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Finding the Fourth Proportional to 991.17, 1,367.96 and 618.27

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Solution

The fourth proportional to 991.17, 1,367.96 and 618.27 is: 853.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.17 : 1,367.96 = 618.27 : x
  2. Step 2: Convert to fraction form
    991.17/1,367.96 = 618.27/x
  3. Step 3: Cross multiply
    991.17x = 1,367.96 × 618.27
  4. Step 4: Simplify right side
    991.17x = 845,768.63
  5. Step 5: Solve for x
    x = 845,768.63/991.17
  6. Step 6: Final answer
    x = 853.30

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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.