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Finding the Fourth Proportional to 57.99, 87.31 and 45.23

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Solution

The fourth proportional to 57.99, 87.31 and 45.23 is: 68.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.99 : 87.31 = 45.23 : x
  2. Step 2: Convert to fraction form
    57.99/87.31 = 45.23/x
  3. Step 3: Cross multiply
    57.99x = 87.31 × 45.23
  4. Step 4: Simplify right side
    57.99x = 3,948.48
  5. Step 5: Solve for x
    x = 3,948.48/57.99
  6. Step 6: Final answer
    x = 68.09

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.