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Finding the Fourth Proportional to 101.44, 139.72 and 100.90

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Solution

The fourth proportional to 101.44, 139.72 and 100.90 is: 138.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.44 : 139.72 = 100.90 : x
  2. Step 2: Convert to fraction form
    101.44/139.72 = 100.90/x
  3. Step 3: Cross multiply
    101.44x = 139.72 × 100.90
  4. Step 4: Simplify right side
    101.44x = 14,097.75
  5. Step 5: Solve for x
    x = 14,097.75/101.44
  6. Step 6: Final answer
    x = 138.98

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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.