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Finding the Fourth Proportional to 18,479.60, 25,519.80 and 15,811.40

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Solution

The fourth proportional to 18,479.60, 25,519.80 and 15,811.40 is: 21,835.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,479.60 : 25,519.80 = 15,811.40 : x
  2. Step 2: Convert to fraction form
    18,479.60/25,519.80 = 15,811.40/x
  3. Step 3: Cross multiply
    18,479.60x = 25,519.80 × 15,811.40
  4. Step 4: Simplify right side
    18,479.60x = 403,503,765.72
  5. Step 5: Solve for x
    x = 403,503,765.72/18,479.60
  6. Step 6: Final answer
    x = 21,835.09

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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.