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Finding the Fourth Proportional to 288.57, 398.25 and 172.16

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Solution

The fourth proportional to 288.57, 398.25 and 172.16 is: 237.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.57 : 398.25 = 172.16 : x
  2. Step 2: Convert to fraction form
    288.57/398.25 = 172.16/x
  3. Step 3: Cross multiply
    288.57x = 398.25 × 172.16
  4. Step 4: Simplify right side
    288.57x = 68,560.73
  5. Step 5: Solve for x
    x = 68,560.73/288.57
  6. Step 6: Final answer
    x = 237.59

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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.