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Finding the Fourth Proportional to 156.80, 217.60 and 145.28

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Solution

The fourth proportional to 156.80, 217.60 and 145.28 is: 201.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.80 : 217.60 = 145.28 : x
  2. Step 2: Convert to fraction form
    156.80/217.60 = 145.28/x
  3. Step 3: Cross multiply
    156.80x = 217.60 × 145.28
  4. Step 4: Simplify right side
    156.80x = 31,612.93
  5. Step 5: Solve for x
    x = 31,612.93/156.80
  6. Step 6: Final answer
    x = 201.61

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.