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Finding the Fourth Proportional to 142.94, 214.14 and 69.68

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Solution

The fourth proportional to 142.94, 214.14 and 69.68 is: 104.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.94 : 214.14 = 69.68 : x
  2. Step 2: Convert to fraction form
    142.94/214.14 = 69.68/x
  3. Step 3: Cross multiply
    142.94x = 214.14 × 69.68
  4. Step 4: Simplify right side
    142.94x = 14,921.28
  5. Step 5: Solve for x
    x = 14,921.28/142.94
  6. Step 6: Final answer
    x = 104.39

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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.