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Finding the Fourth Proportional to 137.72, 190.06 and 85.29

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Solution

The fourth proportional to 137.72, 190.06 and 85.29 is: 117.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.72 : 190.06 = 85.29 : x
  2. Step 2: Convert to fraction form
    137.72/190.06 = 85.29/x
  3. Step 3: Cross multiply
    137.72x = 190.06 × 85.29
  4. Step 4: Simplify right side
    137.72x = 16,211.20
  5. Step 5: Solve for x
    x = 16,211.20/137.72
  6. Step 6: Final answer
    x = 117.72

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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.