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Finding the Fourth Proportional to 85.41, 117.89 and 54.31

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Solution

The fourth proportional to 85.41, 117.89 and 54.31 is: 74.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.41 : 117.89 = 54.31 : x
  2. Step 2: Convert to fraction form
    85.41/117.89 = 54.31/x
  3. Step 3: Cross multiply
    85.41x = 117.89 × 54.31
  4. Step 4: Simplify right side
    85.41x = 6,402.61
  5. Step 5: Solve for x
    x = 6,402.61/85.41
  6. Step 6: Final answer
    x = 74.96

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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.