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Finding the Fourth Proportional to 15,685.54, 21,645.80 and 8,611.98

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Solution

The fourth proportional to 15,685.54, 21,645.80 and 8,611.98 is: 11,884.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,685.54 : 21,645.80 = 8,611.98 : x
  2. Step 2: Convert to fraction form
    15,685.54/21,645.80 = 8,611.98/x
  3. Step 3: Cross multiply
    15,685.54x = 21,645.80 × 8,611.98
  4. Step 4: Simplify right side
    15,685.54x = 186,413,196.68
  5. Step 5: Solve for x
    x = 186,413,196.68/15,685.54
  6. Step 6: Final answer
    x = 11,884.40

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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.