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Finding the Fourth Proportional to 13,278.80, 19,885.80 and 12,695.60

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Solution

The fourth proportional to 13,278.80, 19,885.80 and 12,695.60 is: 19,012.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,278.80 : 19,885.80 = 12,695.60 : x
  2. Step 2: Convert to fraction form
    13,278.80/19,885.80 = 12,695.60/x
  3. Step 3: Cross multiply
    13,278.80x = 19,885.80 × 12,695.60
  4. Step 4: Simplify right side
    13,278.80x = 252,462,162.48
  5. Step 5: Solve for x
    x = 252,462,162.48/13,278.80
  6. Step 6: Final answer
    x = 19,012.42

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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.