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Finding the Fourth Proportional to 139,423.72, 192,416.10 and 79,811.56

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Solution

The fourth proportional to 139,423.72, 192,416.10 and 79,811.56 is: 110,146.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,423.72 : 192,416.10 = 79,811.56 : x
  2. Step 2: Convert to fraction form
    139,423.72/192,416.10 = 79,811.56/x
  3. Step 3: Cross multiply
    139,423.72x = 192,416.10 × 79,811.56
  4. Step 4: Simplify right side
    139,423.72x = 15,357,029,110.12
  5. Step 5: Solve for x
    x = 15,357,029,110.12/139,423.72
  6. Step 6: Final answer
    x = 110,146.46

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1.5x scale

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.