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Finding the Fourth Proportional to 681.90, 1,022.49 and 424.86

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Solution

The fourth proportional to 681.90, 1,022.49 and 424.86 is: 637.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.90 : 1,022.49 = 424.86 : x
  2. Step 2: Convert to fraction form
    681.90/1,022.49 = 424.86/x
  3. Step 3: Cross multiply
    681.90x = 1,022.49 × 424.86
  4. Step 4: Simplify right side
    681.90x = 434,415.10
  5. Step 5: Solve for x
    x = 434,415.10/681.90
  6. Step 6: Final answer
    x = 637.07

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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.