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Finding the Fourth Proportional to 21,471.60, 29,630.88 and 11,912.16

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Solution

The fourth proportional to 21,471.60, 29,630.88 and 11,912.16 is: 16,438.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,471.60 : 29,630.88 = 11,912.16 : x
  2. Step 2: Convert to fraction form
    21,471.60/29,630.88 = 11,912.16/x
  3. Step 3: Cross multiply
    21,471.60x = 29,630.88 × 11,912.16
  4. Step 4: Simplify right side
    21,471.60x = 352,967,783.50
  5. Step 5: Solve for x
    x = 352,967,783.50/21,471.60
  6. Step 6: Final answer
    x = 16,438.82

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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.