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Finding the Fourth Proportional to 100.00, 138.20 and 75.43

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Solution

The fourth proportional to 100.00, 138.20 and 75.43 is: 104.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.00 : 138.20 = 75.43 : x
  2. Step 2: Convert to fraction form
    100.00/138.20 = 75.43/x
  3. Step 3: Cross multiply
    100.00x = 138.20 × 75.43
  4. Step 4: Simplify right side
    100.00x = 10,423.36
  5. Step 5: Solve for x
    x = 10,423.36/100.00
  6. Step 6: Final answer
    x = 104.24

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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.