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Finding the Fourth Proportional to 91.94, 127.40 and 90.83

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Solution

The fourth proportional to 91.94, 127.40 and 90.83 is: 125.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.94 : 127.40 = 90.83 : x
  2. Step 2: Convert to fraction form
    91.94/127.40 = 90.83/x
  3. Step 3: Cross multiply
    91.94x = 127.40 × 90.83
  4. Step 4: Simplify right side
    91.94x = 11,570.65
  5. Step 5: Solve for x
    x = 11,570.65/91.94
  6. Step 6: Final answer
    x = 125.86

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.