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Finding the Fourth Proportional to 518,481.51, 715,517.60 and 289,076.14

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Solution

The fourth proportional to 518,481.51, 715,517.60 and 289,076.14 is: 398,932.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,481.51 : 715,517.60 = 289,076.14 : x
  2. Step 2: Convert to fraction form
    518,481.51/715,517.60 = 289,076.14/x
  3. Step 3: Cross multiply
    518,481.51x = 715,517.60 × 289,076.14
  4. Step 4: Simplify right side
    518,481.51x = 206,839,066,985.13
  5. Step 5: Solve for x
    x = 206,839,066,985.13/518,481.51
  6. Step 6: Final answer
    x = 398,932.39

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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.