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Finding the Fourth Proportional to 681.69, 1,021.92 and 498.84

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Solution

The fourth proportional to 681.69, 1,021.92 and 498.84 is: 747.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.69 : 1,021.92 = 498.84 : x
  2. Step 2: Convert to fraction form
    681.69/1,021.92 = 498.84/x
  3. Step 3: Cross multiply
    681.69x = 1,021.92 × 498.84
  4. Step 4: Simplify right side
    681.69x = 509,774.57
  5. Step 5: Solve for x
    x = 509,774.57/681.69
  6. Step 6: Final answer
    x = 747.81

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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.