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Finding the Fourth Proportional to 1,080.99, 1,491.99 and 639.18

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Solution

The fourth proportional to 1,080.99, 1,491.99 and 639.18 is: 882.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.99 : 1,491.99 = 639.18 : x
  2. Step 2: Convert to fraction form
    1,080.99/1,491.99 = 639.18/x
  3. Step 3: Cross multiply
    1,080.99x = 1,491.99 × 639.18
  4. Step 4: Simplify right side
    1,080.99x = 953,650.17
  5. Step 5: Solve for x
    x = 953,650.17/1,080.99
  6. Step 6: Final answer
    x = 882.20

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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.