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Finding the Fourth Proportional to 681.62, 1,022.42 and 646.99

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Solution

The fourth proportional to 681.62, 1,022.42 and 646.99 is: 970.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.62 : 1,022.42 = 646.99 : x
  2. Step 2: Convert to fraction form
    681.62/1,022.42 = 646.99/x
  3. Step 3: Cross multiply
    681.62x = 1,022.42 × 646.99
  4. Step 4: Simplify right side
    681.62x = 661,495.52
  5. Step 5: Solve for x
    x = 661,495.52/681.62
  6. Step 6: Final answer
    x = 970.48

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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.