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Finding the Fourth Proportional to 139,323.78, 192,278.79 and 78,905.07

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Solution

The fourth proportional to 139,323.78, 192,278.79 and 78,905.07 is: 108,895.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,323.78 : 192,278.79 = 78,905.07 : x
  2. Step 2: Convert to fraction form
    139,323.78/192,278.79 = 78,905.07/x
  3. Step 3: Cross multiply
    139,323.78x = 192,278.79 × 78,905.07
  4. Step 4: Simplify right side
    139,323.78x = 15,171,771,384.47
  5. Step 5: Solve for x
    x = 15,171,771,384.47/139,323.78
  6. Step 6: Final answer
    x = 108,895.78

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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.