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Finding the Fourth Proportional to 469,364.28, 647,828.46 and 393,781.56

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Solution

The fourth proportional to 469,364.28, 647,828.46 and 393,781.56 is: 543,507.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    469,364.28 : 647,828.46 = 393,781.56 : x
  2. Step 2: Convert to fraction form
    469,364.28/647,828.46 = 393,781.56/x
  3. Step 3: Cross multiply
    469,364.28x = 647,828.46 × 393,781.56
  4. Step 4: Simplify right side
    469,364.28x = 255,102,901,591.20
  5. Step 5: Solve for x
    x = 255,102,901,591.20/469,364.28
  6. Step 6: Final answer
    x = 543,507.28

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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.