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Finding the Fourth Proportional to 16,999.80, 25,518.90 and 13,121.40

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Solution

The fourth proportional to 16,999.80, 25,518.90 and 13,121.40 is: 19,696.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    16,999.80 : 25,518.90 = 13,121.40 : x
  2. Step 2: Convert to fraction form
    16,999.80/25,518.90 = 13,121.40/x
  3. Step 3: Cross multiply
    16,999.80x = 25,518.90 × 13,121.40
  4. Step 4: Simplify right side
    16,999.80x = 334,843,694.46
  5. Step 5: Solve for x
    x = 334,843,694.46/16,999.80
  6. Step 6: Final answer
    x = 19,696.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.