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Finding the Fourth Proportional to 819.86, 1,131.18 and 488.35

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Solution

The fourth proportional to 819.86, 1,131.18 and 488.35 is: 673.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.86 : 1,131.18 = 488.35 : x
  2. Step 2: Convert to fraction form
    819.86/1,131.18 = 488.35/x
  3. Step 3: Cross multiply
    819.86x = 1,131.18 × 488.35
  4. Step 4: Simplify right side
    819.86x = 552,406.10
  5. Step 5: Solve for x
    x = 552,406.10/819.86
  6. Step 6: Final answer
    x = 673.78

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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.