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Finding the Fourth Proportional to 69.61, 96.21 and 57.31

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Solution

The fourth proportional to 69.61, 96.21 and 57.31 is: 79.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.61 : 96.21 = 57.31 : x
  2. Step 2: Convert to fraction form
    69.61/96.21 = 57.31/x
  3. Step 3: Cross multiply
    69.61x = 96.21 × 57.31
  4. Step 4: Simplify right side
    69.61x = 5,513.80
  5. Step 5: Solve for x
    x = 5,513.80/69.61
  6. Step 6: Final answer
    x = 79.21

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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.