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Finding the Fourth Proportional to 117.69, 176.51 and 85.17

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Solution

The fourth proportional to 117.69, 176.51 and 85.17 is: 127.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.69 : 176.51 = 85.17 : x
  2. Step 2: Convert to fraction form
    117.69/176.51 = 85.17/x
  3. Step 3: Cross multiply
    117.69x = 176.51 × 85.17
  4. Step 4: Simplify right side
    117.69x = 15,032.93
  5. Step 5: Solve for x
    x = 15,032.93/117.69
  6. Step 6: Final answer
    x = 127.73

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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.