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Finding the Fourth Proportional to 346.52, 519.42 and 138.21

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Solution

The fourth proportional to 346.52, 519.42 and 138.21 is: 207.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.52 : 519.42 = 138.21 : x
  2. Step 2: Convert to fraction form
    346.52/519.42 = 138.21/x
  3. Step 3: Cross multiply
    346.52x = 519.42 × 138.21
  4. Step 4: Simplify right side
    346.52x = 71,787.67
  5. Step 5: Solve for x
    x = 71,787.67/346.52
  6. Step 6: Final answer
    x = 207.17

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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.