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Finding the Fourth Proportional to 16,921.20, 25,382.70 and 8,605.20

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Solution

The fourth proportional to 16,921.20, 25,382.70 and 8,605.20 is: 12,908.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    16,921.20 : 25,382.70 = 8,605.20 : x
  2. Step 2: Convert to fraction form
    16,921.20/25,382.70 = 8,605.20/x
  3. Step 3: Cross multiply
    16,921.20x = 25,382.70 × 8,605.20
  4. Step 4: Simplify right side
    16,921.20x = 218,423,210.04
  5. Step 5: Solve for x
    x = 218,423,210.04/16,921.20
  6. Step 6: Final answer
    x = 12,908.26

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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.