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Finding the Fourth Proportional to 21,015.60, 31,458.60 and 18,682.80

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Solution

The fourth proportional to 21,015.60, 31,458.60 and 18,682.80 is: 27,966.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,015.60 : 31,458.60 = 18,682.80 : x
  2. Step 2: Convert to fraction form
    21,015.60/31,458.60 = 18,682.80/x
  3. Step 3: Cross multiply
    21,015.60x = 31,458.60 × 18,682.80
  4. Step 4: Simplify right side
    21,015.60x = 587,734,732.08
  5. Step 5: Solve for x
    x = 587,734,732.08/21,015.60
  6. Step 6: Final answer
    x = 27,966.59

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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.