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Finding the Fourth Proportional to 61.87, 92.78 and 18.53

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Solution

The fourth proportional to 61.87, 92.78 and 18.53 is: 27.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.87 : 92.78 = 18.53 : x
  2. Step 2: Convert to fraction form
    61.87/92.78 = 18.53/x
  3. Step 3: Cross multiply
    61.87x = 92.78 × 18.53
  4. Step 4: Simplify right side
    61.87x = 1,719.21
  5. Step 5: Solve for x
    x = 1,719.21/61.87
  6. Step 6: Final answer
    x = 27.79

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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.