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Finding the Fourth Proportional to 113.28, 168.84 and 109.32

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Solution

The fourth proportional to 113.28, 168.84 and 109.32 is: 162.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.28 : 168.84 = 109.32 : x
  2. Step 2: Convert to fraction form
    113.28/168.84 = 109.32/x
  3. Step 3: Cross multiply
    113.28x = 168.84 × 109.32
  4. Step 4: Simplify right side
    113.28x = 18,457.59
  5. Step 5: Solve for x
    x = 18,457.59/113.28
  6. Step 6: Final answer
    x = 162.94

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.