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Finding the Fourth Proportional to 817.14, 1,225.85 and 378.83

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Solution

The fourth proportional to 817.14, 1,225.85 and 378.83 is: 568.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.14 : 1,225.85 = 378.83 : x
  2. Step 2: Convert to fraction form
    817.14/1,225.85 = 378.83/x
  3. Step 3: Cross multiply
    817.14x = 1,225.85 × 378.83
  4. Step 4: Simplify right side
    817.14x = 464,388.76
  5. Step 5: Solve for x
    x = 464,388.76/817.14
  6. Step 6: Final answer
    x = 568.31

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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.