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Finding the Fourth Proportional to 80.58, 111.18 and 49.50

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Solution

The fourth proportional to 80.58, 111.18 and 49.50 is: 68.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.58 : 111.18 = 49.50 : x
  2. Step 2: Convert to fraction form
    80.58/111.18 = 49.50/x
  3. Step 3: Cross multiply
    80.58x = 111.18 × 49.50
  4. Step 4: Simplify right side
    80.58x = 5,503.41
  5. Step 5: Solve for x
    x = 5,503.41/80.58
  6. Step 6: Final answer
    x = 68.30

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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.