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Finding the Fourth Proportional to 62.96, 86.81 and 51.28

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Solution

The fourth proportional to 62.96, 86.81 and 51.28 is: 70.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.96 : 86.81 = 51.28 : x
  2. Step 2: Convert to fraction form
    62.96/86.81 = 51.28/x
  3. Step 3: Cross multiply
    62.96x = 86.81 × 51.28
  4. Step 4: Simplify right side
    62.96x = 4,451.14
  5. Step 5: Solve for x
    x = 4,451.14/62.96
  6. Step 6: Final answer
    x = 70.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.