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Finding the Fourth Proportional to 867.20, 1,305.49 and 790.66

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Solution

The fourth proportional to 867.20, 1,305.49 and 790.66 is: 1,190.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.20 : 1,305.49 = 790.66 : x
  2. Step 2: Convert to fraction form
    867.20/1,305.49 = 790.66/x
  3. Step 3: Cross multiply
    867.20x = 1,305.49 × 790.66
  4. Step 4: Simplify right side
    867.20x = 1,032,198.72
  5. Step 5: Solve for x
    x = 1,032,198.72/867.20
  6. Step 6: Final answer
    x = 1,190.27

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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.