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Finding the Fourth Proportional to 28,961, 39,966.22 and 16,385.48

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Solution

The fourth proportional to 28,961, 39,966.22 and 16,385.48 is: 22,611.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,961 : 39,966.22 = 16,385.48 : x
  2. Step 2: Convert to fraction form
    28,961/39,966.22 = 16,385.48/x
  3. Step 3: Cross multiply
    28,961x = 39,966.22 × 16,385.48
  4. Step 4: Simplify right side
    28,961x = 654,865,698.49
  5. Step 5: Solve for x
    x = 654,865,698.49/28,961
  6. Step 6: Final answer
    x = 22,611.99

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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.