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Finding the Fourth Proportional to 982.32, 1,354.85 and 667.82

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Solution

The fourth proportional to 982.32, 1,354.85 and 667.82 is: 921.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.32 : 1,354.85 = 667.82 : x
  2. Step 2: Convert to fraction form
    982.32/1,354.85 = 667.82/x
  3. Step 3: Cross multiply
    982.32x = 1,354.85 × 667.82
  4. Step 4: Simplify right side
    982.32x = 904,792.59
  5. Step 5: Solve for x
    x = 904,792.59/982.32
  6. Step 6: Final answer
    x = 921.08

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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.