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Finding the Fourth Proportional to 209.16, 288.32 and 172.26

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Solution

The fourth proportional to 209.16, 288.32 and 172.26 is: 237.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.16 : 288.32 = 172.26 : x
  2. Step 2: Convert to fraction form
    209.16/288.32 = 172.26/x
  3. Step 3: Cross multiply
    209.16x = 288.32 × 172.26
  4. Step 4: Simplify right side
    209.16x = 49,665.03
  5. Step 5: Solve for x
    x = 49,665.03/209.16
  6. Step 6: Final answer
    x = 237.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.