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Finding the Fourth Proportional to 681.18, 1,021.70 and 315.74

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Solution

The fourth proportional to 681.18, 1,021.70 and 315.74 is: 473.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.18 : 1,021.70 = 315.74 : x
  2. Step 2: Convert to fraction form
    681.18/1,021.70 = 315.74/x
  3. Step 3: Cross multiply
    681.18x = 1,021.70 × 315.74
  4. Step 4: Simplify right side
    681.18x = 322,584.87
  5. Step 5: Solve for x
    x = 322,584.87/681.18
  6. Step 6: Final answer
    x = 473.57

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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.