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Finding the Fourth Proportional to 142.78, 214.17 and 131.63

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Solution

The fourth proportional to 142.78, 214.17 and 131.63 is: 197.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.78 : 214.17 = 131.63 : x
  2. Step 2: Convert to fraction form
    142.78/214.17 = 131.63/x
  3. Step 3: Cross multiply
    142.78x = 214.17 × 131.63
  4. Step 4: Simplify right side
    142.78x = 28,192.11
  5. Step 5: Solve for x
    x = 28,192.11/142.78
  6. Step 6: Final answer
    x = 197.45

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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.