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Finding the Fourth Proportional to 666,515.86, 999,921.72 and 261,747.12

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Solution

The fourth proportional to 666,515.86, 999,921.72 and 261,747.12 is: 392,678.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,515.86 : 999,921.72 = 261,747.12 : x
  2. Step 2: Convert to fraction form
    666,515.86/999,921.72 = 261,747.12/x
  3. Step 3: Cross multiply
    666,515.86x = 999,921.72 × 261,747.12
  4. Step 4: Simplify right side
    666,515.86x = 261,726,625,435.84
  5. Step 5: Solve for x
    x = 261,726,625,435.84/666,515.86
  6. Step 6: Final answer
    x = 392,678.77

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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.