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Finding the Fourth Proportional to 1,080.59, 1,491.11 and 638.41

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Solution

The fourth proportional to 1,080.59, 1,491.11 and 638.41 is: 880.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.59 : 1,491.11 = 638.41 : x
  2. Step 2: Convert to fraction form
    1,080.59/1,491.11 = 638.41/x
  3. Step 3: Cross multiply
    1,080.59x = 1,491.11 × 638.41
  4. Step 4: Simplify right side
    1,080.59x = 951,933.61
  5. Step 5: Solve for x
    x = 951,933.61/1,080.59
  6. Step 6: Final answer
    x = 880.94

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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.