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Finding the Fourth Proportional to 15,777.92, 21,775.60 and 13,120.80

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Solution

The fourth proportional to 15,777.92, 21,775.60 and 13,120.80 is: 18,108.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,777.92 : 21,775.60 = 13,120.80 : x
  2. Step 2: Convert to fraction form
    15,777.92/21,775.60 = 13,120.80/x
  3. Step 3: Cross multiply
    15,777.92x = 21,775.60 × 13,120.80
  4. Step 4: Simplify right side
    15,777.92x = 285,713,292.48
  5. Step 5: Solve for x
    x = 285,713,292.48/15,777.92
  6. Step 6: Final answer
    x = 18,108.43

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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.