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Finding the Fourth Proportional to 85.64, 118.20 and 54.57

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Solution

The fourth proportional to 85.64, 118.20 and 54.57 is: 75.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.64 : 118.20 = 54.57 : x
  2. Step 2: Convert to fraction form
    85.64/118.20 = 54.57/x
  3. Step 3: Cross multiply
    85.64x = 118.20 × 54.57
  4. Step 4: Simplify right side
    85.64x = 6,450.17
  5. Step 5: Solve for x
    x = 6,450.17/85.64
  6. Step 6: Final answer
    x = 75.32

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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.