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Finding the Fourth Proportional to 1,080.66, 1,491.61 and 638.81

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Solution

The fourth proportional to 1,080.66, 1,491.61 and 638.81 is: 881.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.66 : 1,491.61 = 638.81 : x
  2. Step 2: Convert to fraction form
    1,080.66/1,491.61 = 638.81/x
  3. Step 3: Cross multiply
    1,080.66x = 1,491.61 × 638.81
  4. Step 4: Simplify right side
    1,080.66x = 952,847.93
  5. Step 5: Solve for x
    x = 952,847.93/1,080.66
  6. Step 6: Final answer
    x = 881.73

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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.