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Finding the Fourth Proportional to 392,692.38, 589,038.56 and 126,479.80

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Solution

The fourth proportional to 392,692.38, 589,038.56 and 126,479.80 is: 189,719.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    392,692.38 : 589,038.56 = 126,479.80 : x
  2. Step 2: Convert to fraction form
    392,692.38/589,038.56 = 126,479.80/x
  3. Step 3: Cross multiply
    392,692.38x = 589,038.56 × 126,479.80
  4. Step 4: Simplify right side
    392,692.38x = 74,501,479,261.09
  5. Step 5: Solve for x
    x = 74,501,479,261.09/392,692.38
  6. Step 6: Final answer
    x = 189,719.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.