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Finding the Fourth Proportional to 113.90, 157.05 and 67.26

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Solution

The fourth proportional to 113.90, 157.05 and 67.26 is: 92.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.90 : 157.05 = 67.26 : x
  2. Step 2: Convert to fraction form
    113.90/157.05 = 67.26/x
  3. Step 3: Cross multiply
    113.90x = 157.05 × 67.26
  4. Step 4: Simplify right side
    113.90x = 10,563.18
  5. Step 5: Solve for x
    x = 10,563.18/113.90
  6. Step 6: Final answer
    x = 92.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.