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Finding the Fourth Proportional to 139,712.58, 192,808.08 and 79,286.04

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Solution

The fourth proportional to 139,712.58, 192,808.08 and 79,286.04 is: 109,417.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,712.58 : 192,808.08 = 79,286.04 : x
  2. Step 2: Convert to fraction form
    139,712.58/192,808.08 = 79,286.04/x
  3. Step 3: Cross multiply
    139,712.58x = 192,808.08 × 79,286.04
  4. Step 4: Simplify right side
    139,712.58x = 15,286,989,143.20
  5. Step 5: Solve for x
    x = 15,286,989,143.20/139,712.58
  6. Step 6: Final answer
    x = 109,417.41

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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.