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Finding the Fourth Proportional to 348.78, 523.26 and 143.40

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Solution

The fourth proportional to 348.78, 523.26 and 143.40 is: 215.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    348.78 : 523.26 = 143.40 : x
  2. Step 2: Convert to fraction form
    348.78/523.26 = 143.40/x
  3. Step 3: Cross multiply
    348.78x = 523.26 × 143.40
  4. Step 4: Simplify right side
    348.78x = 75,035.48
  5. Step 5: Solve for x
    x = 75,035.48/348.78
  6. Step 6: Final answer
    x = 215.14

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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.