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Finding the Fourth Proportional to 981.96, 1,353.48 and 667.08

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Solution

The fourth proportional to 981.96, 1,353.48 and 667.08 is: 919.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.96 : 1,353.48 = 667.08 : x
  2. Step 2: Convert to fraction form
    981.96/1,353.48 = 667.08/x
  3. Step 3: Cross multiply
    981.96x = 1,353.48 × 667.08
  4. Step 4: Simplify right side
    981.96x = 902,879.44
  5. Step 5: Solve for x
    x = 902,879.44/981.96
  6. Step 6: Final answer
    x = 919.47

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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.