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Finding the Fourth Proportional to 660,440.88, 990,650.70 and 261,085.38

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Solution

The fourth proportional to 660,440.88, 990,650.70 and 261,085.38 is: 391,623.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,440.88 : 990,650.70 = 261,085.38 : x
  2. Step 2: Convert to fraction form
    660,440.88/990,650.70 = 261,085.38/x
  3. Step 3: Cross multiply
    660,440.88x = 990,650.70 × 261,085.38
  4. Step 4: Simplify right side
    660,440.88x = 258,644,414,456.77
  5. Step 5: Solve for x
    x = 258,644,414,456.77/660,440.88
  6. Step 6: Final answer
    x = 391,623.87

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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.