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Finding the Fourth Proportional to 1,081.06, 1,491.88 and 638.96

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Solution

The fourth proportional to 1,081.06, 1,491.88 and 638.96 is: 881.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.06 : 1,491.88 = 638.96 : x
  2. Step 2: Convert to fraction form
    1,081.06/1,491.88 = 638.96/x
  3. Step 3: Cross multiply
    1,081.06x = 1,491.88 × 638.96
  4. Step 4: Simplify right side
    1,081.06x = 953,251.64
  5. Step 5: Solve for x
    x = 953,251.64/1,081.06
  6. Step 6: Final answer
    x = 881.77

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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.