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Finding the Fourth Proportional to 139,621.04, 192,644.28 and 79,178.48

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Solution

The fourth proportional to 139,621.04, 192,644.28 and 79,178.48 is: 109,247.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,621.04 : 192,644.28 = 79,178.48 : x
  2. Step 2: Convert to fraction form
    139,621.04/192,644.28 = 79,178.48/x
  3. Step 3: Cross multiply
    139,621.04x = 192,644.28 × 79,178.48
  4. Step 4: Simplify right side
    139,621.04x = 15,253,281,271.09
  5. Step 5: Solve for x
    x = 15,253,281,271.09/139,621.04
  6. Step 6: Final answer
    x = 109,247.73

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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.