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Finding the Fourth Proportional to 270.84, 405.20 and 171.67

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Solution

The fourth proportional to 270.84, 405.20 and 171.67 is: 256.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    270.84 : 405.20 = 171.67 : x
  2. Step 2: Convert to fraction form
    270.84/405.20 = 171.67/x
  3. Step 3: Cross multiply
    270.84x = 405.20 × 171.67
  4. Step 4: Simplify right side
    270.84x = 69,559.83
  5. Step 5: Solve for x
    x = 69,559.83/270.84
  6. Step 6: Final answer
    x = 256.83

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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.