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Finding the Fourth Proportional to 288.92, 398.70 and 172.40

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Solution

The fourth proportional to 288.92, 398.70 and 172.40 is: 237.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.92 : 398.70 = 172.40 : x
  2. Step 2: Convert to fraction form
    288.92/398.70 = 172.40/x
  3. Step 3: Cross multiply
    288.92x = 398.70 × 172.40
  4. Step 4: Simplify right side
    288.92x = 68,735.88
  5. Step 5: Solve for x
    x = 68,735.88/288.92
  6. Step 6: Final answer
    x = 237.91

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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.