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Finding the Fourth Proportional to 991.22, 1,368.42 and 742.45

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Solution

The fourth proportional to 991.22, 1,368.42 and 742.45 is: 1,024.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.22 : 1,368.42 = 742.45 : x
  2. Step 2: Convert to fraction form
    991.22/1,368.42 = 742.45/x
  3. Step 3: Cross multiply
    991.22x = 1,368.42 × 742.45
  4. Step 4: Simplify right side
    991.22x = 1,015,976.59
  5. Step 5: Solve for x
    x = 1,015,976.59/991.22
  6. Step 6: Final answer
    x = 1,024.98

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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.