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Finding the Fourth Proportional to 15,681.70, 21,640.68 and 8,608.24

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Solution

The fourth proportional to 15,681.70, 21,640.68 and 8,608.24 is: 11,879.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,681.70 : 21,640.68 = 8,608.24 : x
  2. Step 2: Convert to fraction form
    15,681.70/21,640.68 = 8,608.24/x
  3. Step 3: Cross multiply
    15,681.70x = 21,640.68 × 8,608.24
  4. Step 4: Simplify right side
    15,681.70x = 186,288,167.20
  5. Step 5: Solve for x
    x = 186,288,167.20/15,681.70
  6. Step 6: Final answer
    x = 11,879.33

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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.