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Finding the Fourth Proportional to 62.79, 86.69 and 51.15

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Solution

The fourth proportional to 62.79, 86.69 and 51.15 is: 70.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.79 : 86.69 = 51.15 : x
  2. Step 2: Convert to fraction form
    62.79/86.69 = 51.15/x
  3. Step 3: Cross multiply
    62.79x = 86.69 × 51.15
  4. Step 4: Simplify right side
    62.79x = 4,433.94
  5. Step 5: Solve for x
    x = 4,433.94/62.79
  6. Step 6: Final answer
    x = 70.62

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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.