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Finding the Fourth Proportional to 801.82, 1,202.77 and 391.31

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Solution

The fourth proportional to 801.82, 1,202.77 and 391.31 is: 586.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.82 : 1,202.77 = 391.31 : x
  2. Step 2: Convert to fraction form
    801.82/1,202.77 = 391.31/x
  3. Step 3: Cross multiply
    801.82x = 1,202.77 × 391.31
  4. Step 4: Simplify right side
    801.82x = 470,649.91
  5. Step 5: Solve for x
    x = 470,649.91/801.82
  6. Step 6: Final answer
    x = 586.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.