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Finding the Fourth Proportional to 640,418.28, 883,700.64 and 353,899.44

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Solution

The fourth proportional to 640,418.28, 883,700.64 and 353,899.44 is: 488,338.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,418.28 : 883,700.64 = 353,899.44 : x
  2. Step 2: Convert to fraction form
    640,418.28/883,700.64 = 353,899.44/x
  3. Step 3: Cross multiply
    640,418.28x = 883,700.64 × 353,899.44
  4. Step 4: Simplify right side
    640,418.28x = 312,741,161,623.64
  5. Step 5: Solve for x
    x = 312,741,161,623.64/640,418.28
  6. Step 6: Final answer
    x = 488,338.91

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1.5x scale

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.