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Finding the Fourth Proportional to 288.23, 431.87 and 166.28

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Solution

The fourth proportional to 288.23, 431.87 and 166.28 is: 249.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.23 : 431.87 = 166.28 : x
  2. Step 2: Convert to fraction form
    288.23/431.87 = 166.28/x
  3. Step 3: Cross multiply
    288.23x = 431.87 × 166.28
  4. Step 4: Simplify right side
    288.23x = 71,808.35
  5. Step 5: Solve for x
    x = 71,808.35/288.23
  6. Step 6: Final answer
    x = 249.14

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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.