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Finding the Fourth Proportional to 139,704.61, 192,787.01 and 79,271.65

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Solution

The fourth proportional to 139,704.61, 192,787.01 and 79,271.65 is: 109,391.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,704.61 : 192,787.01 = 79,271.65 : x
  2. Step 2: Convert to fraction form
    139,704.61/192,787.01 = 79,271.65/x
  3. Step 3: Cross multiply
    139,704.61x = 192,787.01 × 79,271.65
  4. Step 4: Simplify right side
    139,704.61x = 15,282,544,475.01
  5. Step 5: Solve for x
    x = 15,282,544,475.01/139,704.61
  6. Step 6: Final answer
    x = 109,391.84

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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.