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Finding the Fourth Proportional to 61.86, 92.20 and 61.39

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Solution

The fourth proportional to 61.86, 92.20 and 61.39 is: 91.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.86 : 92.20 = 61.39 : x
  2. Step 2: Convert to fraction form
    61.86/92.20 = 61.39/x
  3. Step 3: Cross multiply
    61.86x = 92.20 × 61.39
  4. Step 4: Simplify right side
    61.86x = 5,660.16
  5. Step 5: Solve for x
    x = 5,660.16/61.86
  6. Step 6: Final answer
    x = 91.50

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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.