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Finding the Fourth Proportional to 287.89, 431.56 and 166.26

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Solution

The fourth proportional to 287.89, 431.56 and 166.26 is: 249.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.89 : 431.56 = 166.26 : x
  2. Step 2: Convert to fraction form
    287.89/431.56 = 166.26/x
  3. Step 3: Cross multiply
    287.89x = 431.56 × 166.26
  4. Step 4: Simplify right side
    287.89x = 71,751.17
  5. Step 5: Solve for x
    x = 71,751.17/287.89
  6. Step 6: Final answer
    x = 249.23

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.