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Finding the Fourth Proportional to 21,668.58, 32,481 and 8,515.80

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Solution

The fourth proportional to 21,668.58, 32,481 and 8,515.80 is: 12,765.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,668.58 : 32,481 = 8,515.80 : x
  2. Step 2: Convert to fraction form
    21,668.58/32,481 = 8,515.80/x
  3. Step 3: Cross multiply
    21,668.58x = 32,481 × 8,515.80
  4. Step 4: Simplify right side
    21,668.58x = 276,601,699.80
  5. Step 5: Solve for x
    x = 276,601,699.80/21,668.58
  6. Step 6: Final answer
    x = 12,765.11

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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.