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Finding the Fourth Proportional to 28,461.80, 42,692.70 and 20,151.20

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Solution

The fourth proportional to 28,461.80, 42,692.70 and 20,151.20 is: 30,226.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,461.80 : 42,692.70 = 20,151.20 : x
  2. Step 2: Convert to fraction form
    28,461.80/42,692.70 = 20,151.20/x
  3. Step 3: Cross multiply
    28,461.80x = 42,692.70 × 20,151.20
  4. Step 4: Simplify right side
    28,461.80x = 860,309,136.24
  5. Step 5: Solve for x
    x = 860,309,136.24/28,461.80
  6. Step 6: Final answer
    x = 30,226.80

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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.