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Finding the Fourth Proportional to 681.12, 1,026.66 and 622.69

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Solution

The fourth proportional to 681.12, 1,026.66 and 622.69 is: 938.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.12 : 1,026.66 = 622.69 : x
  2. Step 2: Convert to fraction form
    681.12/1,026.66 = 622.69/x
  3. Step 3: Cross multiply
    681.12x = 1,026.66 × 622.69
  4. Step 4: Simplify right side
    681.12x = 639,290.68
  5. Step 5: Solve for x
    x = 639,290.68/681.12
  6. Step 6: Final answer
    x = 938.59

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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.