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Finding the Fourth Proportional to 15,685.61, 21,647.48 and 8,613.41

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Solution

The fourth proportional to 15,685.61, 21,647.48 and 8,613.41 is: 11,887.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,685.61 : 21,647.48 = 8,613.41 : x
  2. Step 2: Convert to fraction form
    15,685.61/21,647.48 = 8,613.41/x
  3. Step 3: Cross multiply
    15,685.61x = 21,647.48 × 8,613.41
  4. Step 4: Simplify right side
    15,685.61x = 186,458,469.40
  5. Step 5: Solve for x
    x = 186,458,469.40/15,685.61
  6. Step 6: Final answer
    x = 11,887.23

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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.