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Finding the Fourth Proportional to 991.49, 1,368.39 and 755.11

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Solution

The fourth proportional to 991.49, 1,368.39 and 755.11 is: 1,042.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.49 : 1,368.39 = 755.11 : x
  2. Step 2: Convert to fraction form
    991.49/1,368.39 = 755.11/x
  3. Step 3: Cross multiply
    991.49x = 1,368.39 × 755.11
  4. Step 4: Simplify right side
    991.49x = 1,033,281.82
  5. Step 5: Solve for x
    x = 1,033,281.82/991.49
  6. Step 6: Final answer
    x = 1,042.15

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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.