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Finding the Fourth Proportional to 16,872.20, 23,283.63 and 9,420.20

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Solution

The fourth proportional to 16,872.20, 23,283.63 and 9,420.20 is: 12,999.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    16,872.20 : 23,283.63 = 9,420.20 : x
  2. Step 2: Convert to fraction form
    16,872.20/23,283.63 = 9,420.20/x
  3. Step 3: Cross multiply
    16,872.20x = 23,283.63 × 9,420.20
  4. Step 4: Simplify right side
    16,872.20x = 219,336,334.91
  5. Step 5: Solve for x
    x = 219,336,334.91/16,872.20
  6. Step 6: Final answer
    x = 12,999.87

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1.5x scale

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.