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Finding the Fourth Proportional to 91.60, 137.31 and 48.22

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Solution

The fourth proportional to 91.60, 137.31 and 48.22 is: 72.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.60 : 137.31 = 48.22 : x
  2. Step 2: Convert to fraction form
    91.60/137.31 = 48.22/x
  3. Step 3: Cross multiply
    91.60x = 137.31 × 48.22
  4. Step 4: Simplify right side
    91.60x = 6,621.09
  5. Step 5: Solve for x
    x = 6,621.09/91.60
  6. Step 6: Final answer
    x = 72.28

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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.