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Finding the Fourth Proportional to 156.28, 234.21 and 69.49

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Solution

The fourth proportional to 156.28, 234.21 and 69.49 is: 104.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.28 : 234.21 = 69.49 : x
  2. Step 2: Convert to fraction form
    156.28/234.21 = 69.49/x
  3. Step 3: Cross multiply
    156.28x = 234.21 × 69.49
  4. Step 4: Simplify right side
    156.28x = 16,274.93
  5. Step 5: Solve for x
    x = 16,274.93/156.28
  6. Step 6: Final answer
    x = 104.14

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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.