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Finding the Fourth Proportional to 142.78, 214.09 and 51.43

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Solution

The fourth proportional to 142.78, 214.09 and 51.43 is: 77.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.78 : 214.09 = 51.43 : x
  2. Step 2: Convert to fraction form
    142.78/214.09 = 51.43/x
  3. Step 3: Cross multiply
    142.78x = 214.09 × 51.43
  4. Step 4: Simplify right side
    142.78x = 11,010.65
  5. Step 5: Solve for x
    x = 11,010.65/142.78
  6. Step 6: Final answer
    x = 77.12

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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.