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Finding the Fourth Proportional to 13,788.16, 20,672.64 and 7,108.48

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Solution

The fourth proportional to 13,788.16, 20,672.64 and 7,108.48 is: 10,657.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,788.16 : 20,672.64 = 7,108.48 : x
  2. Step 2: Convert to fraction form
    13,788.16/20,672.64 = 7,108.48/x
  3. Step 3: Cross multiply
    13,788.16x = 20,672.64 × 7,108.48
  4. Step 4: Simplify right side
    13,788.16x = 146,951,047.99
  5. Step 5: Solve for x
    x = 146,951,047.99/13,788.16
  6. Step 6: Final answer
    x = 10,657.77

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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.