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Finding the Fourth Proportional to 288.20, 432.30 and 166.40

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Solution

The fourth proportional to 288.20, 432.30 and 166.40 is: 249.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.20 : 432.30 = 166.40 : x
  2. Step 2: Convert to fraction form
    288.20/432.30 = 166.40/x
  3. Step 3: Cross multiply
    288.20x = 432.30 × 166.40
  4. Step 4: Simplify right side
    288.20x = 71,934.72
  5. Step 5: Solve for x
    x = 71,934.72/288.20
  6. Step 6: Final answer
    x = 249.60

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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.