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Finding the Fourth Proportional to 262.90, 393.53 and 171.40

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Solution

The fourth proportional to 262.90, 393.53 and 171.40 is: 256.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.90 : 393.53 = 171.40 : x
  2. Step 2: Convert to fraction form
    262.90/393.53 = 171.40/x
  3. Step 3: Cross multiply
    262.90x = 393.53 × 171.40
  4. Step 4: Simplify right side
    262.90x = 67,449.50
  5. Step 5: Solve for x
    x = 67,449.50/262.90
  6. Step 6: Final answer
    x = 256.56

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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.