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Finding the Fourth Proportional to 91.99, 127.06 and 68.78

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Solution

The fourth proportional to 91.99, 127.06 and 68.78 is: 95.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.99 : 127.06 = 68.78 : x
  2. Step 2: Convert to fraction form
    91.99/127.06 = 68.78/x
  3. Step 3: Cross multiply
    91.99x = 127.06 × 68.78
  4. Step 4: Simplify right side
    91.99x = 8,738.91
  5. Step 5: Solve for x
    x = 8,738.91/91.99
  6. Step 6: Final answer
    x = 95.00

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.