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Finding the Fourth Proportional to 21,885.50, 30,202.18 and 11,949.50

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Solution

The fourth proportional to 21,885.50, 30,202.18 and 11,949.50 is: 16,490.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,885.50 : 30,202.18 = 11,949.50 : x
  2. Step 2: Convert to fraction form
    21,885.50/30,202.18 = 11,949.50/x
  3. Step 3: Cross multiply
    21,885.50x = 30,202.18 × 11,949.50
  4. Step 4: Simplify right side
    21,885.50x = 360,900,949.91
  5. Step 5: Solve for x
    x = 360,900,949.91/21,885.50
  6. Step 6: Final answer
    x = 16,490.41

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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.