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Finding the Fourth Proportional to 71.98, 107.90 and 49.20

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Solution

The fourth proportional to 71.98, 107.90 and 49.20 is: 73.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.98 : 107.90 = 49.20 : x
  2. Step 2: Convert to fraction form
    71.98/107.90 = 49.20/x
  3. Step 3: Cross multiply
    71.98x = 107.90 × 49.20
  4. Step 4: Simplify right side
    71.98x = 5,308.68
  5. Step 5: Solve for x
    x = 5,308.68/71.98
  6. Step 6: Final answer
    x = 73.75

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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.