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Finding the Fourth Proportional to 62.85, 86.69 and 39.51

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Solution

The fourth proportional to 62.85, 86.69 and 39.51 is: 54.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.85 : 86.69 = 39.51 : x
  2. Step 2: Convert to fraction form
    62.85/86.69 = 39.51/x
  3. Step 3: Cross multiply
    62.85x = 86.69 × 39.51
  4. Step 4: Simplify right side
    62.85x = 3,424.92
  5. Step 5: Solve for x
    x = 3,424.92/62.85
  6. Step 6: Final answer
    x = 54.49

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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.