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Finding the Fourth Proportional to 18,702.27, 28,079.36 and 11,709.81

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Solution

The fourth proportional to 18,702.27, 28,079.36 and 11,709.81 is: 17,580.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,702.27 : 28,079.36 = 11,709.81 : x
  2. Step 2: Convert to fraction form
    18,702.27/28,079.36 = 11,709.81/x
  3. Step 3: Cross multiply
    18,702.27x = 28,079.36 × 11,709.81
  4. Step 4: Simplify right side
    18,702.27x = 328,803,911.97
  5. Step 5: Solve for x
    x = 328,803,911.97/18,702.27
  6. Step 6: Final answer
    x = 17,580.96

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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.