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Finding the Fourth Proportional to 328,858.80, 493,288.20 and 261,936.60

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Solution

The fourth proportional to 328,858.80, 493,288.20 and 261,936.60 is: 392,904.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,858.80 : 493,288.20 = 261,936.60 : x
  2. Step 2: Convert to fraction form
    328,858.80/493,288.20 = 261,936.60/x
  3. Step 3: Cross multiply
    328,858.80x = 493,288.20 × 261,936.60
  4. Step 4: Simplify right side
    328,858.80x = 129,210,233,928.12
  5. Step 5: Solve for x
    x = 129,210,233,928.12/328,858.80
  6. Step 6: Final answer
    x = 392,904.90

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1.5x scale

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.