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Finding the Fourth Proportional to 663,838.80, 916,179.84 and 405,662.64

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Solution

The fourth proportional to 663,838.80, 916,179.84 and 405,662.64 is: 559,864.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,838.80 : 916,179.84 = 405,662.64 : x
  2. Step 2: Convert to fraction form
    663,838.80/916,179.84 = 405,662.64/x
  3. Step 3: Cross multiply
    663,838.80x = 916,179.84 × 405,662.64
  4. Step 4: Simplify right side
    663,838.80x = 371,659,932,609.18
  5. Step 5: Solve for x
    x = 371,659,932,609.18/663,838.80
  6. Step 6: Final answer
    x = 559,864.73

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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.