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Finding the Fourth Proportional to 817.20, 1,222.56 and 745.92

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Solution

The fourth proportional to 817.20, 1,222.56 and 745.92 is: 1,115.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.20 : 1,222.56 = 745.92 : x
  2. Step 2: Convert to fraction form
    817.20/1,222.56 = 745.92/x
  3. Step 3: Cross multiply
    817.20x = 1,222.56 × 745.92
  4. Step 4: Simplify right side
    817.20x = 911,931.96
  5. Step 5: Solve for x
    x = 911,931.96/817.20
  6. Step 6: Final answer
    x = 1,115.92

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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.