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Finding the Fourth Proportional to 91.64, 137.51 and 84.75

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Solution

The fourth proportional to 91.64, 137.51 and 84.75 is: 127.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.64 : 137.51 = 84.75 : x
  2. Step 2: Convert to fraction form
    91.64/137.51 = 84.75/x
  3. Step 3: Cross multiply
    91.64x = 137.51 × 84.75
  4. Step 4: Simplify right side
    91.64x = 11,653.97
  5. Step 5: Solve for x
    x = 11,653.97/91.64
  6. Step 6: Final answer
    x = 127.17

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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.