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Finding the Fourth Proportional to 91.76, 137.65 and 30.91

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Solution

The fourth proportional to 91.76, 137.65 and 30.91 is: 46.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.76 : 137.65 = 30.91 : x
  2. Step 2: Convert to fraction form
    91.76/137.65 = 30.91/x
  3. Step 3: Cross multiply
    91.76x = 137.65 × 30.91
  4. Step 4: Simplify right side
    91.76x = 4,254.76
  5. Step 5: Solve for x
    x = 4,254.76/91.76
  6. Step 6: Final answer
    x = 46.37

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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.