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Finding the Fourth Proportional to 172.28, 258.10 and 99.08

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Solution

The fourth proportional to 172.28, 258.10 and 99.08 is: 148.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.28 : 258.10 = 99.08 : x
  2. Step 2: Convert to fraction form
    172.28/258.10 = 99.08/x
  3. Step 3: Cross multiply
    172.28x = 258.10 × 99.08
  4. Step 4: Simplify right side
    172.28x = 25,571.01
  5. Step 5: Solve for x
    x = 25,571.01/172.28
  6. Step 6: Final answer
    x = 148.43

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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.