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Finding the Fourth Proportional to 139,639.74, 192,704.03 and 79,210.50

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Solution

The fourth proportional to 139,639.74, 192,704.03 and 79,210.50 is: 109,311.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,639.74 : 192,704.03 = 79,210.50 : x
  2. Step 2: Convert to fraction form
    139,639.74/192,704.03 = 79,210.50/x
  3. Step 3: Cross multiply
    139,639.74x = 192,704.03 × 79,210.50
  4. Step 4: Simplify right side
    139,639.74x = 15,264,181,208.74
  5. Step 5: Solve for x
    x = 15,264,181,208.74/139,639.74
  6. Step 6: Final answer
    x = 109,311.16

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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.