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Finding the Fourth Proportional to 85.19, 127.89 and 54.65

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Solution

The fourth proportional to 85.19, 127.89 and 54.65 is: 82.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.19 : 127.89 = 54.65 : x
  2. Step 2: Convert to fraction form
    85.19/127.89 = 54.65/x
  3. Step 3: Cross multiply
    85.19x = 127.89 × 54.65
  4. Step 4: Simplify right side
    85.19x = 6,989.51
  5. Step 5: Solve for x
    x = 6,989.51/85.19
  6. Step 6: Final answer
    x = 82.05

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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.