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Finding the Fourth Proportional to 392,999.40, 589,499.10 and 143,778.60

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Solution

The fourth proportional to 392,999.40, 589,499.10 and 143,778.60 is: 215,667.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    392,999.40 : 589,499.10 = 143,778.60 : x
  2. Step 2: Convert to fraction form
    392,999.40/589,499.10 = 143,778.60/x
  3. Step 3: Cross multiply
    392,999.40x = 589,499.10 × 143,778.60
  4. Step 4: Simplify right side
    392,999.40x = 84,757,355,299.26
  5. Step 5: Solve for x
    x = 84,757,355,299.26/392,999.40
  6. Step 6: Final answer
    x = 215,667.90

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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.