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Finding the Fourth Proportional to 113.44, 168.90 and 112.90

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Solution

The fourth proportional to 113.44, 168.90 and 112.90 is: 168.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.44 : 168.90 = 112.90 : x
  2. Step 2: Convert to fraction form
    113.44/168.90 = 112.90/x
  3. Step 3: Cross multiply
    113.44x = 168.90 × 112.90
  4. Step 4: Simplify right side
    113.44x = 19,068.81
  5. Step 5: Solve for x
    x = 19,068.81/113.44
  6. Step 6: Final answer
    x = 168.10

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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.