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Finding the Fourth Proportional to 61.85, 92.79 and 25.76

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Solution

The fourth proportional to 61.85, 92.79 and 25.76 is: 38.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.85 : 92.79 = 25.76 : x
  2. Step 2: Convert to fraction form
    61.85/92.79 = 25.76/x
  3. Step 3: Cross multiply
    61.85x = 92.79 × 25.76
  4. Step 4: Simplify right side
    61.85x = 2,389.81
  5. Step 5: Solve for x
    x = 2,389.81/61.85
  6. Step 6: Final answer
    x = 38.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.