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Finding the Fourth Proportional to 85.63, 118.21 and 54.55

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Solution

The fourth proportional to 85.63, 118.21 and 54.55 is: 75.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.63 : 118.21 = 54.55 : x
  2. Step 2: Convert to fraction form
    85.63/118.21 = 54.55/x
  3. Step 3: Cross multiply
    85.63x = 118.21 × 54.55
  4. Step 4: Simplify right side
    85.63x = 6,448.36
  5. Step 5: Solve for x
    x = 6,448.36/85.63
  6. Step 6: Final answer
    x = 75.30

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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.