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Finding the Fourth Proportional to 20,656.84, 30,781.95 and 19,410.12

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Solution

The fourth proportional to 20,656.84, 30,781.95 and 19,410.12 is: 28,924.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,656.84 : 30,781.95 = 19,410.12 : x
  2. Step 2: Convert to fraction form
    20,656.84/30,781.95 = 19,410.12/x
  3. Step 3: Cross multiply
    20,656.84x = 30,781.95 × 19,410.12
  4. Step 4: Simplify right side
    20,656.84x = 597,481,343.33
  5. Step 5: Solve for x
    x = 597,481,343.33/20,656.84
  6. Step 6: Final answer
    x = 28,924.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.