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Finding the Fourth Proportional to 117.94, 177 and 57.15

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Solution

The fourth proportional to 117.94, 177 and 57.15 is: 85.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.94 : 177 = 57.15 : x
  2. Step 2: Convert to fraction form
    117.94/177 = 57.15/x
  3. Step 3: Cross multiply
    117.94x = 177 × 57.15
  4. Step 4: Simplify right side
    117.94x = 10,115.55
  5. Step 5: Solve for x
    x = 10,115.55/117.94
  6. Step 6: Final answer
    x = 85.77

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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.