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Finding the Fourth Proportional to 1,008.18, 1,391.33 and 635.11

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Solution

The fourth proportional to 1,008.18, 1,391.33 and 635.11 is: 876.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.18 : 1,391.33 = 635.11 : x
  2. Step 2: Convert to fraction form
    1,008.18/1,391.33 = 635.11/x
  3. Step 3: Cross multiply
    1,008.18x = 1,391.33 × 635.11
  4. Step 4: Simplify right side
    1,008.18x = 883,645.71
  5. Step 5: Solve for x
    x = 883,645.71/1,008.18
  6. Step 6: Final answer
    x = 876.48

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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.