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Finding the Fourth Proportional to 15,655.80, 21,604.20 and 8,940.12

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Solution

The fourth proportional to 15,655.80, 21,604.20 and 8,940.12 is: 12,336.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,655.80 : 21,604.20 = 8,940.12 : x
  2. Step 2: Convert to fraction form
    15,655.80/21,604.20 = 8,940.12/x
  3. Step 3: Cross multiply
    15,655.80x = 21,604.20 × 8,940.12
  4. Step 4: Simplify right side
    15,655.80x = 193,144,076.25
  5. Step 5: Solve for x
    x = 193,144,076.25/15,655.80
  6. Step 6: Final answer
    x = 12,336.90

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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.