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Finding the Fourth Proportional to 100.45, 138.43 and 94.38

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Solution

The fourth proportional to 100.45, 138.43 and 94.38 is: 130.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.45 : 138.43 = 94.38 : x
  2. Step 2: Convert to fraction form
    100.45/138.43 = 94.38/x
  3. Step 3: Cross multiply
    100.45x = 138.43 × 94.38
  4. Step 4: Simplify right side
    100.45x = 13,065.02
  5. Step 5: Solve for x
    x = 13,065.02/100.45
  6. Step 6: Final answer
    x = 130.06

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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.