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Finding the Fourth Proportional to 139,437.78, 192,423.60 and 79,019.92

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Solution

The fourth proportional to 139,437.78, 192,423.60 and 79,019.92 is: 109,047.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,437.78 : 192,423.60 = 79,019.92 : x
  2. Step 2: Convert to fraction form
    139,437.78/192,423.60 = 79,019.92/x
  3. Step 3: Cross multiply
    139,437.78x = 192,423.60 × 79,019.92
  4. Step 4: Simplify right side
    139,437.78x = 15,205,297,478.11
  5. Step 5: Solve for x
    x = 15,205,297,478.11/139,437.78
  6. Step 6: Final answer
    x = 109,047.19

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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.