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Finding the Fourth Proportional to 345.27, 517.87 and 268.72

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Solution

The fourth proportional to 345.27, 517.87 and 268.72 is: 403.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.27 : 517.87 = 268.72 : x
  2. Step 2: Convert to fraction form
    345.27/517.87 = 268.72/x
  3. Step 3: Cross multiply
    345.27x = 517.87 × 268.72
  4. Step 4: Simplify right side
    345.27x = 139,162.03
  5. Step 5: Solve for x
    x = 139,162.03/345.27
  6. Step 6: Final answer
    x = 403.05

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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.