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Finding the Fourth Proportional to 14,553.60, 21,856.80 and 12,739.20

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Solution

The fourth proportional to 14,553.60, 21,856.80 and 12,739.20 is: 19,131.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,553.60 : 21,856.80 = 12,739.20 : x
  2. Step 2: Convert to fraction form
    14,553.60/21,856.80 = 12,739.20/x
  3. Step 3: Cross multiply
    14,553.60x = 21,856.80 × 12,739.20
  4. Step 4: Simplify right side
    14,553.60x = 278,438,146.56
  5. Step 5: Solve for x
    x = 278,438,146.56/14,553.60
  6. Step 6: Final answer
    x = 19,131.91

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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.