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Finding the Fourth Proportional to 38,479.60, 57,719.40 and 21,890.80

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Solution

The fourth proportional to 38,479.60, 57,719.40 and 21,890.80 is: 32,836.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,479.60 : 57,719.40 = 21,890.80 : x
  2. Step 2: Convert to fraction form
    38,479.60/57,719.40 = 21,890.80/x
  3. Step 3: Cross multiply
    38,479.60x = 57,719.40 × 21,890.80
  4. Step 4: Simplify right side
    38,479.60x = 1,263,523,841.52
  5. Step 5: Solve for x
    x = 1,263,523,841.52/38,479.60
  6. Step 6: Final answer
    x = 32,836.20

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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.