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Finding the Fourth Proportional to 69.21, 95.40 and 47.06

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Solution

The fourth proportional to 69.21, 95.40 and 47.06 is: 64.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.21 : 95.40 = 47.06 : x
  2. Step 2: Convert to fraction form
    69.21/95.40 = 47.06/x
  3. Step 3: Cross multiply
    69.21x = 95.40 × 47.06
  4. Step 4: Simplify right side
    69.21x = 4,489.64
  5. Step 5: Solve for x
    x = 4,489.64/69.21
  6. Step 6: Final answer
    x = 64.87

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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.