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Finding the Fourth Proportional to 112.19, 168.05 and 90.40

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Solution

The fourth proportional to 112.19, 168.05 and 90.40 is: 135.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.19 : 168.05 = 90.40 : x
  2. Step 2: Convert to fraction form
    112.19/168.05 = 90.40/x
  3. Step 3: Cross multiply
    112.19x = 168.05 × 90.40
  4. Step 4: Simplify right side
    112.19x = 15,191.72
  5. Step 5: Solve for x
    x = 15,191.72/112.19
  6. Step 6: Final answer
    x = 135.41

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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.