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Finding the Fourth Proportional to 172.56, 258.56 and 99.20

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Solution

The fourth proportional to 172.56, 258.56 and 99.20 is: 148.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.56 : 258.56 = 99.20 : x
  2. Step 2: Convert to fraction form
    172.56/258.56 = 99.20/x
  3. Step 3: Cross multiply
    172.56x = 258.56 × 99.20
  4. Step 4: Simplify right side
    172.56x = 25,649.15
  5. Step 5: Solve for x
    x = 25,649.15/172.56
  6. Step 6: Final answer
    x = 148.64

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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.