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Finding the Fourth Proportional to 28,487.80, 42,731.70 and 12,692.80

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Solution

The fourth proportional to 28,487.80, 42,731.70 and 12,692.80 is: 19,039.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,487.80 : 42,731.70 = 12,692.80 : x
  2. Step 2: Convert to fraction form
    28,487.80/42,731.70 = 12,692.80/x
  3. Step 3: Cross multiply
    28,487.80x = 42,731.70 × 12,692.80
  4. Step 4: Simplify right side
    28,487.80x = 542,384,921.76
  5. Step 5: Solve for x
    x = 542,384,921.76/28,487.80
  6. Step 6: Final answer
    x = 19,039.20

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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.