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Finding the Fourth Proportional to 432.20, 648 and 172.24

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Solution

The fourth proportional to 432.20, 648 and 172.24 is: 258.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.20 : 648 = 172.24 : x
  2. Step 2: Convert to fraction form
    432.20/648 = 172.24/x
  3. Step 3: Cross multiply
    432.20x = 648 × 172.24
  4. Step 4: Simplify right side
    432.20x = 111,611.52
  5. Step 5: Solve for x
    x = 111,611.52/432.20
  6. Step 6: Final answer
    x = 258.24

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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.