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Finding the Fourth Proportional to 172.16, 258 and 118.16

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Solution

The fourth proportional to 172.16, 258 and 118.16 is: 177.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.16 : 258 = 118.16 : x
  2. Step 2: Convert to fraction form
    172.16/258 = 118.16/x
  3. Step 3: Cross multiply
    172.16x = 258 × 118.16
  4. Step 4: Simplify right side
    172.16x = 30,485.28
  5. Step 5: Solve for x
    x = 30,485.28/172.16
  6. Step 6: Final answer
    x = 177.08

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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.