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Finding the Fourth Proportional to 288.68, 398.40 and 172.24

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Solution

The fourth proportional to 288.68, 398.40 and 172.24 is: 237.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.68 : 398.40 = 172.24 : x
  2. Step 2: Convert to fraction form
    288.68/398.40 = 172.24/x
  3. Step 3: Cross multiply
    288.68x = 398.40 × 172.24
  4. Step 4: Simplify right side
    288.68x = 68,620.42
  5. Step 5: Solve for x
    x = 68,620.42/288.68
  6. Step 6: Final answer
    x = 237.70

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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.