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Finding the Fourth Proportional to 15,674.21, 21,630.41 and 8,959.99

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Solution

The fourth proportional to 15,674.21, 21,630.41 and 8,959.99 is: 12,364.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,674.21 : 21,630.41 = 8,959.99 : x
  2. Step 2: Convert to fraction form
    15,674.21/21,630.41 = 8,959.99/x
  3. Step 3: Cross multiply
    15,674.21x = 21,630.41 × 8,959.99
  4. Step 4: Simplify right side
    15,674.21x = 193,808,149.14
  5. Step 5: Solve for x
    x = 193,808,149.14/15,674.21
  6. Step 6: Final answer
    x = 12,364.78

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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.