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Finding the Fourth Proportional to 57.51, 85.86 and 51.39

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Solution

The fourth proportional to 57.51, 85.86 and 51.39 is: 76.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.51 : 85.86 = 51.39 : x
  2. Step 2: Convert to fraction form
    57.51/85.86 = 51.39/x
  3. Step 3: Cross multiply
    57.51x = 85.86 × 51.39
  4. Step 4: Simplify right side
    57.51x = 4,412.35
  5. Step 5: Solve for x
    x = 4,412.35/57.51
  6. Step 6: Final answer
    x = 76.72

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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.