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Finding the Fourth Proportional to 505,109.81, 697,067.80 and 287,312.89

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Solution

The fourth proportional to 505,109.81, 697,067.80 and 287,312.89 is: 396,501.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    505,109.81 : 697,067.80 = 287,312.89 : x
  2. Step 2: Convert to fraction form
    505,109.81/697,067.80 = 287,312.89/x
  3. Step 3: Cross multiply
    505,109.81x = 697,067.80 × 287,312.89
  4. Step 4: Simplify right side
    505,109.81x = 200,276,561,682.99
  5. Step 5: Solve for x
    x = 200,276,561,682.99/505,109.81
  6. Step 6: Final answer
    x = 396,501.03

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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.