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Finding the Fourth Proportional to 18,706.87, 28,054.81 and 15,411.79

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Solution

The fourth proportional to 18,706.87, 28,054.81 and 15,411.79 is: 23,113.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,706.87 : 28,054.81 = 15,411.79 : x
  2. Step 2: Convert to fraction form
    18,706.87/28,054.81 = 15,411.79/x
  3. Step 3: Cross multiply
    18,706.87x = 28,054.81 × 15,411.79
  4. Step 4: Simplify right side
    18,706.87x = 432,374,840.21
  5. Step 5: Solve for x
    x = 432,374,840.21/18,706.87
  6. Step 6: Final answer
    x = 23,113.16

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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.