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Finding the Fourth Proportional to 639,744, 959,547.36 and 339,906.72

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Solution

The fourth proportional to 639,744, 959,547.36 and 339,906.72 is: 509,823.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,744 : 959,547.36 = 339,906.72 : x
  2. Step 2: Convert to fraction form
    639,744/959,547.36 = 339,906.72/x
  3. Step 3: Cross multiply
    639,744x = 959,547.36 × 339,906.72
  4. Step 4: Simplify right side
    639,744x = 326,156,595,822.26
  5. Step 5: Solve for x
    x = 326,156,595,822.26/639,744
  6. Step 6: Final answer
    x = 509,823.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.