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Finding the Fourth Proportional to 21,821.50, 30,111.17 and 12,260.11

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Solution

The fourth proportional to 21,821.50, 30,111.17 and 12,260.11 is: 16,917.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,821.50 : 30,111.17 = 12,260.11 : x
  2. Step 2: Convert to fraction form
    21,821.50/30,111.17 = 12,260.11/x
  3. Step 3: Cross multiply
    21,821.50x = 30,111.17 × 12,260.11
  4. Step 4: Simplify right side
    21,821.50x = 369,166,256.43
  5. Step 5: Solve for x
    x = 369,166,256.43/21,821.50
  6. Step 6: Final answer
    x = 16,917.55

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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.