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Finding the Fourth Proportional to 681.53, 1,021.05 and 475.70

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Solution

The fourth proportional to 681.53, 1,021.05 and 475.70 is: 712.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.53 : 1,021.05 = 475.70 : x
  2. Step 2: Convert to fraction form
    681.53/1,021.05 = 475.70/x
  3. Step 3: Cross multiply
    681.53x = 1,021.05 × 475.70
  4. Step 4: Simplify right side
    681.53x = 485,708.38
  5. Step 5: Solve for x
    x = 485,708.38/681.53
  6. Step 6: Final answer
    x = 712.68

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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.