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Finding the Fourth Proportional to 981.97, 1,355.75 and 683.11

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Solution

The fourth proportional to 981.97, 1,355.75 and 683.11 is: 943.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.97 : 1,355.75 = 683.11 : x
  2. Step 2: Convert to fraction form
    981.97/1,355.75 = 683.11/x
  3. Step 3: Cross multiply
    981.97x = 1,355.75 × 683.11
  4. Step 4: Simplify right side
    981.97x = 926,119.58
  5. Step 5: Solve for x
    x = 926,119.58/981.97
  6. Step 6: Final answer
    x = 943.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.