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Finding the Fourth Proportional to 18,905.15, 28,356.35 and 9,041.78

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Solution

The fourth proportional to 18,905.15, 28,356.35 and 9,041.78 is: 13,562.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,905.15 : 28,356.35 = 9,041.78 : x
  2. Step 2: Convert to fraction form
    18,905.15/28,356.35 = 9,041.78/x
  3. Step 3: Cross multiply
    18,905.15x = 28,356.35 × 9,041.78
  4. Step 4: Simplify right side
    18,905.15x = 256,391,691.31
  5. Step 5: Solve for x
    x = 256,391,691.31/18,905.15
  6. Step 6: Final answer
    x = 13,562.01

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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.