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Finding the Fourth Proportional to 139.21, 192.18 and 102.45

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Solution

The fourth proportional to 139.21, 192.18 and 102.45 is: 141.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.21 : 192.18 = 102.45 : x
  2. Step 2: Convert to fraction form
    139.21/192.18 = 102.45/x
  3. Step 3: Cross multiply
    139.21x = 192.18 × 102.45
  4. Step 4: Simplify right side
    139.21x = 19,688.84
  5. Step 5: Solve for x
    x = 19,688.84/139.21
  6. Step 6: Final answer
    x = 141.43

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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.