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Finding the Fourth Proportional to 100.63, 138.81 and 73.03

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Solution

The fourth proportional to 100.63, 138.81 and 73.03 is: 100.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.63 : 138.81 = 73.03 : x
  2. Step 2: Convert to fraction form
    100.63/138.81 = 73.03/x
  3. Step 3: Cross multiply
    100.63x = 138.81 × 73.03
  4. Step 4: Simplify right side
    100.63x = 10,137.29
  5. Step 5: Solve for x
    x = 10,137.29/100.63
  6. Step 6: Final answer
    x = 100.74

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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.