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Finding the Fourth Proportional to 21,305.60, 31,996.80 and 15,468.80

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Solution

The fourth proportional to 21,305.60, 31,996.80 and 15,468.80 is: 23,231.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,305.60 : 31,996.80 = 15,468.80 : x
  2. Step 2: Convert to fraction form
    21,305.60/31,996.80 = 15,468.80/x
  3. Step 3: Cross multiply
    21,305.60x = 31,996.80 × 15,468.80
  4. Step 4: Simplify right side
    21,305.60x = 494,952,099.84
  5. Step 5: Solve for x
    x = 494,952,099.84/21,305.60
  6. Step 6: Final answer
    x = 23,231.08

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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.