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Finding the Fourth Proportional to 85.17, 117.49 and 49.69

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Solution

The fourth proportional to 85.17, 117.49 and 49.69 is: 68.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.17 : 117.49 = 49.69 : x
  2. Step 2: Convert to fraction form
    85.17/117.49 = 49.69/x
  3. Step 3: Cross multiply
    85.17x = 117.49 × 49.69
  4. Step 4: Simplify right side
    85.17x = 5,838.08
  5. Step 5: Solve for x
    x = 5,838.08/85.17
  6. Step 6: Final answer
    x = 68.55

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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.