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Finding the Fourth Proportional to 681.40, 1,021.91 and 242.59

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Solution

The fourth proportional to 681.40, 1,021.91 and 242.59 is: 363.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.40 : 1,021.91 = 242.59 : x
  2. Step 2: Convert to fraction form
    681.40/1,021.91 = 242.59/x
  3. Step 3: Cross multiply
    681.40x = 1,021.91 × 242.59
  4. Step 4: Simplify right side
    681.40x = 247,905.15
  5. Step 5: Solve for x
    x = 247,905.15/681.40
  6. Step 6: Final answer
    x = 363.82

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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.