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Finding the Fourth Proportional to 270.90, 374.10 and 172.89

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Solution

The fourth proportional to 270.90, 374.10 and 172.89 is: 238.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    270.90 : 374.10 = 172.89 : x
  2. Step 2: Convert to fraction form
    270.90/374.10 = 172.89/x
  3. Step 3: Cross multiply
    270.90x = 374.10 × 172.89
  4. Step 4: Simplify right side
    270.90x = 64,678.15
  5. Step 5: Solve for x
    x = 64,678.15/270.90
  6. Step 6: Final answer
    x = 238.75

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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.