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Finding the Fourth Proportional to 345.36, 518.41 and 257.82

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Solution

The fourth proportional to 345.36, 518.41 and 257.82 is: 387.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.36 : 518.41 = 257.82 : x
  2. Step 2: Convert to fraction form
    345.36/518.41 = 257.82/x
  3. Step 3: Cross multiply
    345.36x = 518.41 × 257.82
  4. Step 4: Simplify right side
    345.36x = 133,656.47
  5. Step 5: Solve for x
    x = 133,656.47/345.36
  6. Step 6: Final answer
    x = 387.01

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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.