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Finding the Fourth Proportional to 172.16, 258.08 and 136.32

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Solution

The fourth proportional to 172.16, 258.08 and 136.32 is: 204.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.16 : 258.08 = 136.32 : x
  2. Step 2: Convert to fraction form
    172.16/258.08 = 136.32/x
  3. Step 3: Cross multiply
    172.16x = 258.08 × 136.32
  4. Step 4: Simplify right side
    172.16x = 35,181.47
  5. Step 5: Solve for x
    x = 35,181.47/172.16
  6. Step 6: Final answer
    x = 204.35

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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.