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Finding the Fourth Proportional to 1,109.96, 1,531.40 and 667.96

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Solution

The fourth proportional to 1,109.96, 1,531.40 and 667.96 is: 921.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.96 : 1,531.40 = 667.96 : x
  2. Step 2: Convert to fraction form
    1,109.96/1,531.40 = 667.96/x
  3. Step 3: Cross multiply
    1,109.96x = 1,531.40 × 667.96
  4. Step 4: Simplify right side
    1,109.96x = 1,022,913.94
  5. Step 5: Solve for x
    x = 1,022,913.94/1,109.96
  6. Step 6: Final answer
    x = 921.58

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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.