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Finding the Fourth Proportional to 169.28, 253.43 and 128.86

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Solution

The fourth proportional to 169.28, 253.43 and 128.86 is: 192.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.28 : 253.43 = 128.86 : x
  2. Step 2: Convert to fraction form
    169.28/253.43 = 128.86/x
  3. Step 3: Cross multiply
    169.28x = 253.43 × 128.86
  4. Step 4: Simplify right side
    169.28x = 32,656.99
  5. Step 5: Solve for x
    x = 32,656.99/169.28
  6. Step 6: Final answer
    x = 192.92

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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.