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Finding the Fourth Proportional to 139.83, 193.05 and 105.24

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Solution

The fourth proportional to 139.83, 193.05 and 105.24 is: 145.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.83 : 193.05 = 105.24 : x
  2. Step 2: Convert to fraction form
    139.83/193.05 = 105.24/x
  3. Step 3: Cross multiply
    139.83x = 193.05 × 105.24
  4. Step 4: Simplify right side
    139.83x = 20,316.58
  5. Step 5: Solve for x
    x = 20,316.58/139.83
  6. Step 6: Final answer
    x = 145.29

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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.