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Finding the Fourth Proportional to 666,445.86, 999,687.83 and 261,621.23

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Solution

The fourth proportional to 666,445.86, 999,687.83 and 261,621.23 is: 392,439.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,445.86 : 999,687.83 = 261,621.23 : x
  2. Step 2: Convert to fraction form
    666,445.86/999,687.83 = 261,621.23/x
  3. Step 3: Cross multiply
    666,445.86x = 999,687.83 × 261,621.23
  4. Step 4: Simplify right side
    666,445.86x = 261,539,553,394.09
  5. Step 5: Solve for x
    x = 261,539,553,394.09/666,445.86
  6. Step 6: Final answer
    x = 392,439.31

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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.