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Finding the Fourth Proportional to 57.30, 85.80 and 36.90

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Solution

The fourth proportional to 57.30, 85.80 and 36.90 is: 55.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.30 : 85.80 = 36.90 : x
  2. Step 2: Convert to fraction form
    57.30/85.80 = 36.90/x
  3. Step 3: Cross multiply
    57.30x = 85.80 × 36.90
  4. Step 4: Simplify right side
    57.30x = 3,166.02
  5. Step 5: Solve for x
    x = 3,166.02/57.30
  6. Step 6: Final answer
    x = 55.25

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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.