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Finding the Fourth Proportional to 681.74, 1,021.77 and 475.19

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Solution

The fourth proportional to 681.74, 1,021.77 and 475.19 is: 712.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.74 : 1,021.77 = 475.19 : x
  2. Step 2: Convert to fraction form
    681.74/1,021.77 = 475.19/x
  3. Step 3: Cross multiply
    681.74x = 1,021.77 × 475.19
  4. Step 4: Simplify right side
    681.74x = 485,529.78
  5. Step 5: Solve for x
    x = 485,529.78/681.74
  6. Step 6: Final answer
    x = 712.20

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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.