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Finding the Fourth Proportional to 21,990, 30,348.12 and 12,055.92

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Solution

The fourth proportional to 21,990, 30,348.12 and 12,055.92 is: 16,638.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,990 : 30,348.12 = 12,055.92 : x
  2. Step 2: Convert to fraction form
    21,990/30,348.12 = 12,055.92/x
  3. Step 3: Cross multiply
    21,990x = 30,348.12 × 12,055.92
  4. Step 4: Simplify right side
    21,990x = 365,874,506.87
  5. Step 5: Solve for x
    x = 365,874,506.87/21,990
  6. Step 6: Final answer
    x = 16,638.22

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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.