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Finding the Fourth Proportional to 981.23, 1,355.13 and 667.89

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Solution

The fourth proportional to 981.23, 1,355.13 and 667.89 is: 922.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.23 : 1,355.13 = 667.89 : x
  2. Step 2: Convert to fraction form
    981.23/1,355.13 = 667.89/x
  3. Step 3: Cross multiply
    981.23x = 1,355.13 × 667.89
  4. Step 4: Simplify right side
    981.23x = 905,077.78
  5. Step 5: Solve for x
    x = 905,077.78/981.23
  6. Step 6: Final answer
    x = 922.40

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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.