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Finding the Fourth Proportional to 156.63, 234.83 and 53.90

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Solution

The fourth proportional to 156.63, 234.83 and 53.90 is: 80.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.63 : 234.83 = 53.90 : x
  2. Step 2: Convert to fraction form
    156.63/234.83 = 53.90/x
  3. Step 3: Cross multiply
    156.63x = 234.83 × 53.90
  4. Step 4: Simplify right side
    156.63x = 12,657.18
  5. Step 5: Solve for x
    x = 12,657.18/156.63
  6. Step 6: Final answer
    x = 80.81

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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.