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Finding the Fourth Proportional to 288.90, 398.56 and 172.46

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Solution

The fourth proportional to 288.90, 398.56 and 172.46 is: 237.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.90 : 398.56 = 172.46 : x
  2. Step 2: Convert to fraction form
    288.90/398.56 = 172.46/x
  3. Step 3: Cross multiply
    288.90x = 398.56 × 172.46
  4. Step 4: Simplify right side
    288.90x = 68,735.66
  5. Step 5: Solve for x
    x = 68,735.66/288.90
  6. Step 6: Final answer
    x = 237.92

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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.