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Finding the Fourth Proportional to 1,081.03, 1,491.73 and 638.85

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Solution

The fourth proportional to 1,081.03, 1,491.73 and 638.85 is: 881.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.03 : 1,491.73 = 638.85 : x
  2. Step 2: Convert to fraction form
    1,081.03/1,491.73 = 638.85/x
  3. Step 3: Cross multiply
    1,081.03x = 1,491.73 × 638.85
  4. Step 4: Simplify right side
    1,081.03x = 952,991.71
  5. Step 5: Solve for x
    x = 952,991.71/1,081.03
  6. Step 6: Final answer
    x = 881.56

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1.5x scale

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.