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Finding the Fourth Proportional to 505,116.99, 697,077.72 and 287,320.05

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Solution

The fourth proportional to 505,116.99, 697,077.72 and 287,320.05 is: 396,510.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    505,116.99 : 697,077.72 = 287,320.05 : x
  2. Step 2: Convert to fraction form
    505,116.99/697,077.72 = 287,320.05/x
  3. Step 3: Cross multiply
    505,116.99x = 697,077.72 × 287,320.05
  4. Step 4: Simplify right side
    505,116.99x = 200,284,405,364.29
  5. Step 5: Solve for x
    x = 200,284,405,364.29/505,116.99
  6. Step 6: Final answer
    x = 396,510.93

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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.