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Finding the Fourth Proportional to 666,991.72, 920,443.12 and 361,061.88

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Solution

The fourth proportional to 666,991.72, 920,443.12 and 361,061.88 is: 498,262.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,991.72 : 920,443.12 = 361,061.88 : x
  2. Step 2: Convert to fraction form
    666,991.72/920,443.12 = 361,061.88/x
  3. Step 3: Cross multiply
    666,991.72x = 920,443.12 × 361,061.88
  4. Step 4: Simplify right side
    666,991.72x = 332,336,923,340.27
  5. Step 5: Solve for x
    x = 332,336,923,340.27/666,991.72
  6. Step 6: Final answer
    x = 498,262.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.