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Finding the Fourth Proportional to 139.30, 192.24 and 77.13

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Solution

The fourth proportional to 139.30, 192.24 and 77.13 is: 106.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.30 : 192.24 = 77.13 : x
  2. Step 2: Convert to fraction form
    139.30/192.24 = 77.13/x
  3. Step 3: Cross multiply
    139.30x = 192.24 × 77.13
  4. Step 4: Simplify right side
    139.30x = 14,827.47
  5. Step 5: Solve for x
    x = 14,827.47/139.30
  6. Step 6: Final answer
    x = 106.44

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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.