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Finding the Fourth Proportional to 117.81, 176.31 and 85.19

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Solution

The fourth proportional to 117.81, 176.31 and 85.19 is: 127.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.81 : 176.31 = 85.19 : x
  2. Step 2: Convert to fraction form
    117.81/176.31 = 85.19/x
  3. Step 3: Cross multiply
    117.81x = 176.31 × 85.19
  4. Step 4: Simplify right side
    117.81x = 15,018.97
  5. Step 5: Solve for x
    x = 15,018.97/117.81
  6. Step 6: Final answer
    x = 127.48

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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.