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Finding the Fourth Proportional to 817.89, 1,227.38 and 385.17

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Solution

The fourth proportional to 817.89, 1,227.38 and 385.17 is: 578.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.89 : 1,227.38 = 385.17 : x
  2. Step 2: Convert to fraction form
    817.89/1,227.38 = 385.17/x
  3. Step 3: Cross multiply
    817.89x = 1,227.38 × 385.17
  4. Step 4: Simplify right side
    817.89x = 472,748.03
  5. Step 5: Solve for x
    x = 472,748.03/817.89
  6. Step 6: Final answer
    x = 578.01

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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.