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Finding the Fourth Proportional to 991.17, 1,367.62 and 598.22

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Solution

The fourth proportional to 991.17, 1,367.62 and 598.22 is: 825.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.17 : 1,367.62 = 598.22 : x
  2. Step 2: Convert to fraction form
    991.17/1,367.62 = 598.22/x
  3. Step 3: Cross multiply
    991.17x = 1,367.62 × 598.22
  4. Step 4: Simplify right side
    991.17x = 818,129.30
  5. Step 5: Solve for x
    x = 818,129.30/991.17
  6. Step 6: Final answer
    x = 825.42

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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.