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Finding the Fourth Proportional to 16,439, 22,685.90 and 8,987

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Solution

The fourth proportional to 16,439, 22,685.90 and 8,987 is: 12,402.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    16,439 : 22,685.90 = 8,987 : x
  2. Step 2: Convert to fraction form
    16,439/22,685.90 = 8,987/x
  3. Step 3: Cross multiply
    16,439x = 22,685.90 × 8,987
  4. Step 4: Simplify right side
    16,439x = 203,878,183.30
  5. Step 5: Solve for x
    x = 203,878,183.30/16,439
  6. Step 6: Final answer
    x = 12,402.10

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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.