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Finding the Fourth Proportional to 1,081.15, 1,491.51 and 638.86

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Solution

The fourth proportional to 1,081.15, 1,491.51 and 638.86 is: 881.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.15 : 1,491.51 = 638.86 : x
  2. Step 2: Convert to fraction form
    1,081.15/1,491.51 = 638.86/x
  3. Step 3: Cross multiply
    1,081.15x = 1,491.51 × 638.86
  4. Step 4: Simplify right side
    1,081.15x = 952,866.08
  5. Step 5: Solve for x
    x = 952,866.08/1,081.15
  6. Step 6: Final answer
    x = 881.34

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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.