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Finding the Fourth Proportional to 19,220.80, 28,692.20 and 16,888

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Solution

The fourth proportional to 19,220.80, 28,692.20 and 16,888 is: 25,209.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,220.80 : 28,692.20 = 16,888 : x
  2. Step 2: Convert to fraction form
    19,220.80/28,692.20 = 16,888/x
  3. Step 3: Cross multiply
    19,220.80x = 28,692.20 × 16,888
  4. Step 4: Simplify right side
    19,220.80x = 484,553,873.60
  5. Step 5: Solve for x
    x = 484,553,873.60/19,220.80
  6. Step 6: Final answer
    x = 25,209.87

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.