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Finding the Fourth Proportional to 432,018.77, 647,971.25 and 128,406.44

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Solution

The fourth proportional to 432,018.77, 647,971.25 and 128,406.44 is: 192,592.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    432,018.77 : 647,971.25 = 128,406.44 : x
  2. Step 2: Convert to fraction form
    432,018.77/647,971.25 = 128,406.44/x
  3. Step 3: Cross multiply
    432,018.77x = 647,971.25 × 128,406.44
  4. Step 4: Simplify right side
    432,018.77x = 83,203,681,402.90
  5. Step 5: Solve for x
    x = 83,203,681,402.90/432,018.77
  6. Step 6: Final answer
    x = 192,592.75

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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.