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Finding the Fourth Proportional to 57.12, 85.30 and 51.04

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Solution

The fourth proportional to 57.12, 85.30 and 51.04 is: 76.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.12 : 85.30 = 51.04 : x
  2. Step 2: Convert to fraction form
    57.12/85.30 = 51.04/x
  3. Step 3: Cross multiply
    57.12x = 85.30 × 51.04
  4. Step 4: Simplify right side
    57.12x = 4,353.71
  5. Step 5: Solve for x
    x = 4,353.71/57.12
  6. Step 6: Final answer
    x = 76.22

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.