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Finding the Fourth Proportional to 92.21, 127.30 and 61.15

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Solution

The fourth proportional to 92.21, 127.30 and 61.15 is: 84.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.21 : 127.30 = 61.15 : x
  2. Step 2: Convert to fraction form
    92.21/127.30 = 61.15/x
  3. Step 3: Cross multiply
    92.21x = 127.30 × 61.15
  4. Step 4: Simplify right side
    92.21x = 7,784.63
  5. Step 5: Solve for x
    x = 7,784.63/92.21
  6. Step 6: Final answer
    x = 84.42

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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.