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Finding the Fourth Proportional to 139,769.78, 192,877.02 and 85,412.84

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Solution

The fourth proportional to 139,769.78, 192,877.02 and 85,412.84 is: 117,866.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,769.78 : 192,877.02 = 85,412.84 : x
  2. Step 2: Convert to fraction form
    139,769.78/192,877.02 = 85,412.84/x
  3. Step 3: Cross multiply
    139,769.78x = 192,877.02 × 85,412.84
  4. Step 4: Simplify right side
    139,769.78x = 16,474,173,084.55
  5. Step 5: Solve for x
    x = 16,474,173,084.55/139,769.78
  6. Step 6: Final answer
    x = 117,866.49

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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.