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Finding the Fourth Proportional to 91.47, 137.21 and 61.10

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Solution

The fourth proportional to 91.47, 137.21 and 61.10 is: 91.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.47 : 137.21 = 61.10 : x
  2. Step 2: Convert to fraction form
    91.47/137.21 = 61.10/x
  3. Step 3: Cross multiply
    91.47x = 137.21 × 61.10
  4. Step 4: Simplify right side
    91.47x = 8,382.54
  5. Step 5: Solve for x
    x = 8,382.54/91.47
  6. Step 6: Final answer
    x = 91.64

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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.