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Finding the Fourth Proportional to 201.65, 278.59 and 172.45

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Solution

The fourth proportional to 201.65, 278.59 and 172.45 is: 238.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.65 : 278.59 = 172.45 : x
  2. Step 2: Convert to fraction form
    201.65/278.59 = 172.45/x
  3. Step 3: Cross multiply
    201.65x = 278.59 × 172.45
  4. Step 4: Simplify right side
    201.65x = 48,042.58
  5. Step 5: Solve for x
    x = 48,042.58/201.65
  6. Step 6: Final answer
    x = 238.24

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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.