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Finding the Fourth Proportional to 485,611.20, 728,438.40 and 165,758.40

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Solution

The fourth proportional to 485,611.20, 728,438.40 and 165,758.40 is: 248,644.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,611.20 : 728,438.40 = 165,758.40 : x
  2. Step 2: Convert to fraction form
    485,611.20/728,438.40 = 165,758.40/x
  3. Step 3: Cross multiply
    485,611.20x = 728,438.40 × 165,758.40
  4. Step 4: Simplify right side
    485,611.20x = 120,744,783,682.56
  5. Step 5: Solve for x
    x = 120,744,783,682.56/485,611.20
  6. Step 6: Final answer
    x = 248,644.97

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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.