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Finding the Fourth Proportional to 399,713.30, 551,223.11 and 261,686.26

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Solution

The fourth proportional to 399,713.30, 551,223.11 and 261,686.26 is: 360,877.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,713.30 : 551,223.11 = 261,686.26 : x
  2. Step 2: Convert to fraction form
    399,713.30/551,223.11 = 261,686.26/x
  3. Step 3: Cross multiply
    399,713.30x = 551,223.11 × 261,686.26
  4. Step 4: Simplify right side
    399,713.30x = 144,247,510,016.92
  5. Step 5: Solve for x
    x = 144,247,510,016.92/399,713.30
  6. Step 6: Final answer
    x = 360,877.44

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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.