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Finding the Fourth Proportional to 16,820, 23,212.40 and 9,368

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Solution

The fourth proportional to 16,820, 23,212.40 and 9,368 is: 12,928.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    16,820 : 23,212.40 = 9,368 : x
  2. Step 2: Convert to fraction form
    16,820/23,212.40 = 9,368/x
  3. Step 3: Cross multiply
    16,820x = 23,212.40 × 9,368
  4. Step 4: Simplify right side
    16,820x = 217,453,763.20
  5. Step 5: Solve for x
    x = 217,453,763.20/16,820
  6. Step 6: Final answer
    x = 12,928.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.