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Finding the Fourth Proportional to 56.95, 85.20 and 38.92

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Solution

The fourth proportional to 56.95, 85.20 and 38.92 is: 58.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.95 : 85.20 = 38.92 : x
  2. Step 2: Convert to fraction form
    56.95/85.20 = 38.92/x
  3. Step 3: Cross multiply
    56.95x = 85.20 × 38.92
  4. Step 4: Simplify right side
    56.95x = 3,315.98
  5. Step 5: Solve for x
    x = 3,315.98/56.95
  6. Step 6: Final answer
    x = 58.23

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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.