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Finding the Fourth Proportional to 21,777.92, 32,660.64 and 11,921.60

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Solution

The fourth proportional to 21,777.92, 32,660.64 and 11,921.60 is: 17,878.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,777.92 : 32,660.64 = 11,921.60 : x
  2. Step 2: Convert to fraction form
    21,777.92/32,660.64 = 11,921.60/x
  3. Step 3: Cross multiply
    21,777.92x = 32,660.64 × 11,921.60
  4. Step 4: Simplify right side
    21,777.92x = 389,367,085.82
  5. Step 5: Solve for x
    x = 389,367,085.82/21,777.92
  6. Step 6: Final answer
    x = 17,878.98

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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.