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Finding the Fourth Proportional to 139,392.84, 192,319.74 and 78,953.88

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Solution

The fourth proportional to 139,392.84, 192,319.74 and 78,953.88 is: 108,932.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,392.84 : 192,319.74 = 78,953.88 : x
  2. Step 2: Convert to fraction form
    139,392.84/192,319.74 = 78,953.88/x
  3. Step 3: Cross multiply
    139,392.84x = 192,319.74 × 78,953.88
  4. Step 4: Simplify right side
    139,392.84x = 15,184,389,673.59
  5. Step 5: Solve for x
    x = 15,184,389,673.59/139,392.84
  6. Step 6: Final answer
    x = 108,932.35

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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.