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Finding the Fourth Proportional to 61.78, 92.22 and 61.21

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Solution

The fourth proportional to 61.78, 92.22 and 61.21 is: 91.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.78 : 92.22 = 61.21 : x
  2. Step 2: Convert to fraction form
    61.78/92.22 = 61.21/x
  3. Step 3: Cross multiply
    61.78x = 92.22 × 61.21
  4. Step 4: Simplify right side
    61.78x = 5,644.79
  5. Step 5: Solve for x
    x = 5,644.79/61.78
  6. Step 6: Final answer
    x = 91.37

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.