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Finding the Fourth Proportional to 71.45, 107.10 and 47.09

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Solution

The fourth proportional to 71.45, 107.10 and 47.09 is: 70.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.45 : 107.10 = 47.09 : x
  2. Step 2: Convert to fraction form
    71.45/107.10 = 47.09/x
  3. Step 3: Cross multiply
    71.45x = 107.10 × 47.09
  4. Step 4: Simplify right side
    71.45x = 5,043.34
  5. Step 5: Solve for x
    x = 5,043.34/71.45
  6. Step 6: Final answer
    x = 70.59

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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.