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Finding the Fourth Proportional to 817.77, 1,231.79 and 745.10

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Solution

The fourth proportional to 817.77, 1,231.79 and 745.10 is: 1,122.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.77 : 1,231.79 = 745.10 : x
  2. Step 2: Convert to fraction form
    817.77/1,231.79 = 745.10/x
  3. Step 3: Cross multiply
    817.77x = 1,231.79 × 745.10
  4. Step 4: Simplify right side
    817.77x = 917,796.84
  5. Step 5: Solve for x
    x = 917,796.84/817.77
  6. Step 6: Final answer
    x = 1,122.32

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.