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Finding the Fourth Proportional to 817.72, 1,228.16 and 700.85

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Solution

The fourth proportional to 817.72, 1,228.16 and 700.85 is: 1,052.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.72 : 1,228.16 = 700.85 : x
  2. Step 2: Convert to fraction form
    817.72/1,228.16 = 700.85/x
  3. Step 3: Cross multiply
    817.72x = 1,228.16 × 700.85
  4. Step 4: Simplify right side
    817.72x = 860,755.94
  5. Step 5: Solve for x
    x = 860,755.94/817.72
  6. Step 6: Final answer
    x = 1,052.63

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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.