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Finding the Fourth Proportional to 18,913.68, 28,370.49 and 18,886.32

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Solution

The fourth proportional to 18,913.68, 28,370.49 and 18,886.32 is: 28,329.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,913.68 : 28,370.49 = 18,886.32 : x
  2. Step 2: Convert to fraction form
    18,913.68/28,370.49 = 18,886.32/x
  3. Step 3: Cross multiply
    18,913.68x = 28,370.49 × 18,886.32
  4. Step 4: Simplify right side
    18,913.68x = 535,814,152.70
  5. Step 5: Solve for x
    x = 535,814,152.70/18,913.68
  6. Step 6: Final answer
    x = 28,329.45

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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.