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Finding the Fourth Proportional to 15,810.10, 21,818.10 and 8,640.22

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Solution

The fourth proportional to 15,810.10, 21,818.10 and 8,640.22 is: 11,923.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,810.10 : 21,818.10 = 8,640.22 : x
  2. Step 2: Convert to fraction form
    15,810.10/21,818.10 = 8,640.22/x
  3. Step 3: Cross multiply
    15,810.10x = 21,818.10 × 8,640.22
  4. Step 4: Simplify right side
    15,810.10x = 188,513,183.98
  5. Step 5: Solve for x
    x = 188,513,183.98/15,810.10
  6. Step 6: Final answer
    x = 11,923.59

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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.