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Finding the Fourth Proportional to 15,205.55, 20,982.45 and 8,490.78

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Solution

The fourth proportional to 15,205.55, 20,982.45 and 8,490.78 is: 11,716.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,205.55 : 20,982.45 = 8,490.78 : x
  2. Step 2: Convert to fraction form
    15,205.55/20,982.45 = 8,490.78/x
  3. Step 3: Cross multiply
    15,205.55x = 20,982.45 × 8,490.78
  4. Step 4: Simplify right side
    15,205.55x = 178,157,315.76
  5. Step 5: Solve for x
    x = 178,157,315.76/15,205.55
  6. Step 6: Final answer
    x = 11,716.60

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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.