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Finding the Fourth Proportional to 57.38, 85.89 and 51.51

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Solution

The fourth proportional to 57.38, 85.89 and 51.51 is: 77.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.38 : 85.89 = 51.51 : x
  2. Step 2: Convert to fraction form
    57.38/85.89 = 51.51/x
  3. Step 3: Cross multiply
    57.38x = 85.89 × 51.51
  4. Step 4: Simplify right side
    57.38x = 4,424.19
  5. Step 5: Solve for x
    x = 4,424.19/57.38
  6. Step 6: Final answer
    x = 77.10

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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.