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Finding the Fourth Proportional to 131.74, 181.84 and 85.11

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Solution

The fourth proportional to 131.74, 181.84 and 85.11 is: 117.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.74 : 181.84 = 85.11 : x
  2. Step 2: Convert to fraction form
    131.74/181.84 = 85.11/x
  3. Step 3: Cross multiply
    131.74x = 181.84 × 85.11
  4. Step 4: Simplify right side
    131.74x = 15,477.07
  5. Step 5: Solve for x
    x = 15,477.07/131.74
  6. Step 6: Final answer
    x = 117.48

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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.