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Finding the Fourth Proportional to 156.63, 234.90 and 69.91

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Solution

The fourth proportional to 156.63, 234.90 and 69.91 is: 104.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.63 : 234.90 = 69.91 : x
  2. Step 2: Convert to fraction form
    156.63/234.90 = 69.91/x
  3. Step 3: Cross multiply
    156.63x = 234.90 × 69.91
  4. Step 4: Simplify right side
    156.63x = 16,422.22
  5. Step 5: Solve for x
    x = 16,422.22/156.63
  6. Step 6: Final answer
    x = 104.85

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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.