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Finding the Fourth Proportional to 100.00, 138.00 and 68.92

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Solution

The fourth proportional to 100.00, 138.00 and 68.92 is: 95.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.00 : 138.00 = 68.92 : x
  2. Step 2: Convert to fraction form
    100.00/138.00 = 68.92/x
  3. Step 3: Cross multiply
    100.00x = 138.00 × 68.92
  4. Step 4: Simplify right side
    100.00x = 9,510.87
  5. Step 5: Solve for x
    x = 9,510.87/100.00
  6. Step 6: Final answer
    x = 95.11

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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.