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Finding the Fourth Proportional to 1,080.88, 1,491.20 and 749.12

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Solution

The fourth proportional to 1,080.88, 1,491.20 and 749.12 is: 1,033.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.88 : 1,491.20 = 749.12 : x
  2. Step 2: Convert to fraction form
    1,080.88/1,491.20 = 749.12/x
  3. Step 3: Cross multiply
    1,080.88x = 1,491.20 × 749.12
  4. Step 4: Simplify right side
    1,080.88x = 1,117,087.74
  5. Step 5: Solve for x
    x = 1,117,087.74/1,080.88
  6. Step 6: Final answer
    x = 1,033.50

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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.