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Finding the Fourth Proportional to 28,469.70, 42,692.04 and 15,139.80

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Solution

The fourth proportional to 28,469.70, 42,692.04 and 15,139.80 is: 22,703.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,469.70 : 42,692.04 = 15,139.80 : x
  2. Step 2: Convert to fraction form
    28,469.70/42,692.04 = 15,139.80/x
  3. Step 3: Cross multiply
    28,469.70x = 42,692.04 × 15,139.80
  4. Step 4: Simplify right side
    28,469.70x = 646,348,947.19
  5. Step 5: Solve for x
    x = 646,348,947.19/28,469.70
  6. Step 6: Final answer
    x = 22,703.05

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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.