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Finding the Fourth Proportional to 92.61, 138.91 and 30.91

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Solution

The fourth proportional to 92.61, 138.91 and 30.91 is: 46.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.61 : 138.91 = 30.91 : x
  2. Step 2: Convert to fraction form
    92.61/138.91 = 30.91/x
  3. Step 3: Cross multiply
    92.61x = 138.91 × 30.91
  4. Step 4: Simplify right side
    92.61x = 4,293.71
  5. Step 5: Solve for x
    x = 4,293.71/92.61
  6. Step 6: Final answer
    x = 46.36

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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.