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Finding the Fourth Proportional to 20,881.60, 31,257.60 and 18,548.80

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Solution

The fourth proportional to 20,881.60, 31,257.60 and 18,548.80 is: 27,765.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,881.60 : 31,257.60 = 18,548.80 : x
  2. Step 2: Convert to fraction form
    20,881.60/31,257.60 = 18,548.80/x
  3. Step 3: Cross multiply
    20,881.60x = 31,257.60 × 18,548.80
  4. Step 4: Simplify right side
    20,881.60x = 579,790,970.88
  5. Step 5: Solve for x
    x = 579,790,970.88/20,881.60
  6. Step 6: Final answer
    x = 27,765.64

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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.