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Finding the Fourth Proportional to 991.14, 1,367.18 and 617.83

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Solution

The fourth proportional to 991.14, 1,367.18 and 617.83 is: 852.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.14 : 1,367.18 = 617.83 : x
  2. Step 2: Convert to fraction form
    991.14/1,367.18 = 617.83/x
  3. Step 3: Cross multiply
    991.14x = 1,367.18 × 617.83
  4. Step 4: Simplify right side
    991.14x = 844,680.63
  5. Step 5: Solve for x
    x = 844,680.63/991.14
  6. Step 6: Final answer
    x = 852.23

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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.