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Finding the Fourth Proportional to 139,612.32, 192,621.48 and 79,178.22

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Solution

The fourth proportional to 139,612.32, 192,621.48 and 79,178.22 is: 109,241.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,612.32 : 192,621.48 = 79,178.22 : x
  2. Step 2: Convert to fraction form
    139,612.32/192,621.48 = 79,178.22/x
  3. Step 3: Cross multiply
    139,612.32x = 192,621.48 × 79,178.22
  4. Step 4: Simplify right side
    139,612.32x = 15,251,425,920.17
  5. Step 5: Solve for x
    x = 15,251,425,920.17/139,612.32
  6. Step 6: Final answer
    x = 109,241.26

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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.