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Finding the Fourth Proportional to 660,388.92, 990,023.78 and 261,311.24

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Solution

The fourth proportional to 660,388.92, 990,023.78 and 261,311.24 is: 391,745.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,388.92 : 990,023.78 = 261,311.24 : x
  2. Step 2: Convert to fraction form
    660,388.92/990,023.78 = 261,311.24/x
  3. Step 3: Cross multiply
    660,388.92x = 990,023.78 × 261,311.24
  4. Step 4: Simplify right side
    660,388.92x = 258,704,341,581.29
  5. Step 5: Solve for x
    x = 258,704,341,581.29/660,388.92
  6. Step 6: Final answer
    x = 391,745.43

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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.