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Finding the Fourth Proportional to 345.61, 517.76 and 268.19

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Solution

The fourth proportional to 345.61, 517.76 and 268.19 is: 401.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.61 : 517.76 = 268.19 : x
  2. Step 2: Convert to fraction form
    345.61/517.76 = 268.19/x
  3. Step 3: Cross multiply
    345.61x = 517.76 × 268.19
  4. Step 4: Simplify right side
    345.61x = 138,858.05
  5. Step 5: Solve for x
    x = 138,858.05/345.61
  6. Step 6: Final answer
    x = 401.78

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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.