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Finding the Fourth Proportional to 270.25, 405.11 and 172.87

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Solution

The fourth proportional to 270.25, 405.11 and 172.87 is: 259.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    270.25 : 405.11 = 172.87 : x
  2. Step 2: Convert to fraction form
    270.25/405.11 = 172.87/x
  3. Step 3: Cross multiply
    270.25x = 405.11 × 172.87
  4. Step 4: Simplify right side
    270.25x = 70,030.79
  5. Step 5: Solve for x
    x = 70,030.79/270.25
  6. Step 6: Final answer
    x = 259.14

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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.