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Finding the Fourth Proportional to 53.91, 81 and 52.20

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Solution

The fourth proportional to 53.91, 81 and 52.20 is: 78.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.91 : 81 = 52.20 : x
  2. Step 2: Convert to fraction form
    53.91/81 = 52.20/x
  3. Step 3: Cross multiply
    53.91x = 81 × 52.20
  4. Step 4: Simplify right side
    53.91x = 4,228.20
  5. Step 5: Solve for x
    x = 4,228.20/53.91
  6. Step 6: Final answer
    x = 78.43

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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.