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Finding the Fourth Proportional to 101.45, 140.99 and 100.34

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Solution

The fourth proportional to 101.45, 140.99 and 100.34 is: 139.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.45 : 140.99 = 100.34 : x
  2. Step 2: Convert to fraction form
    101.45/140.99 = 100.34/x
  3. Step 3: Cross multiply
    101.45x = 140.99 × 100.34
  4. Step 4: Simplify right side
    101.45x = 14,146.82
  5. Step 5: Solve for x
    x = 14,146.82/101.45
  6. Step 6: Final answer
    x = 139.44

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.