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Finding the Fourth Proportional to 61.72, 92.09 and 61.24

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Solution

The fourth proportional to 61.72, 92.09 and 61.24 is: 91.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.72 : 92.09 = 61.24 : x
  2. Step 2: Convert to fraction form
    61.72/92.09 = 61.24/x
  3. Step 3: Cross multiply
    61.72x = 92.09 × 61.24
  4. Step 4: Simplify right side
    61.72x = 5,639.59
  5. Step 5: Solve for x
    x = 5,639.59/61.72
  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.