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Finding the Fourth Proportional to 18,785.47, 28,178.08 and 7,692.17

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Solution

The fourth proportional to 18,785.47, 28,178.08 and 7,692.17 is: 11,538.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,785.47 : 28,178.08 = 7,692.17 : x
  2. Step 2: Convert to fraction form
    18,785.47/28,178.08 = 7,692.17/x
  3. Step 3: Cross multiply
    18,785.47x = 28,178.08 × 7,692.17
  4. Step 4: Simplify right side
    18,785.47x = 216,750,421.51
  5. Step 5: Solve for x
    x = 216,750,421.51/18,785.47
  6. Step 6: Final answer
    x = 11,538.20

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Similar ratio
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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.