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Finding the Fourth Proportional to 641,814.12, 885,698.82 and 387,305.64

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Solution

The fourth proportional to 641,814.12, 885,698.82 and 387,305.64 is: 534,478.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,814.12 : 885,698.82 = 387,305.64 : x
  2. Step 2: Convert to fraction form
    641,814.12/885,698.82 = 387,305.64/x
  3. Step 3: Cross multiply
    641,814.12x = 885,698.82 × 387,305.64
  4. Step 4: Simplify right side
    641,814.12x = 343,036,148,327.35
  5. Step 5: Solve for x
    x = 343,036,148,327.35/641,814.12
  6. Step 6: Final answer
    x = 534,478.97

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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.