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Finding the Fourth Proportional to 13,770.40, 20,655.60 and 8,579.20

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Solution

The fourth proportional to 13,770.40, 20,655.60 and 8,579.20 is: 12,868.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,770.40 : 20,655.60 = 8,579.20 : x
  2. Step 2: Convert to fraction form
    13,770.40/20,655.60 = 8,579.20/x
  3. Step 3: Cross multiply
    13,770.40x = 20,655.60 × 8,579.20
  4. Step 4: Simplify right side
    13,770.40x = 177,208,523.52
  5. Step 5: Solve for x
    x = 177,208,523.52/13,770.40
  6. Step 6: Final answer
    x = 12,868.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.