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Finding the Fourth Proportional to 981.88, 1,355.56 and 683.56

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Solution

The fourth proportional to 981.88, 1,355.56 and 683.56 is: 943.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.88 : 1,355.56 = 683.56 : x
  2. Step 2: Convert to fraction form
    981.88/1,355.56 = 683.56/x
  3. Step 3: Cross multiply
    981.88x = 1,355.56 × 683.56
  4. Step 4: Simplify right side
    981.88x = 926,606.59
  5. Step 5: Solve for x
    x = 926,606.59/981.88
  6. Step 6: Final answer
    x = 943.71

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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.