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Finding the Fourth Proportional to 18,857.78, 28,282.35 and 8,472.50

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Solution

The fourth proportional to 18,857.78, 28,282.35 and 8,472.50 is: 12,706.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,857.78 : 28,282.35 = 8,472.50 : x
  2. Step 2: Convert to fraction form
    18,857.78/28,282.35 = 8,472.50/x
  3. Step 3: Cross multiply
    18,857.78x = 28,282.35 × 8,472.50
  4. Step 4: Simplify right side
    18,857.78x = 239,622,210.38
  5. Step 5: Solve for x
    x = 239,622,210.38/18,857.78
  6. Step 6: Final answer
    x = 12,706.81

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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.