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Finding the Fourth Proportional to 28,415.13, 42,620.91 and 8,692.12

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Solution

The fourth proportional to 28,415.13, 42,620.91 and 8,692.12 is: 13,037.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,415.13 : 42,620.91 = 8,692.12 : x
  2. Step 2: Convert to fraction form
    28,415.13/42,620.91 = 8,692.12/x
  3. Step 3: Cross multiply
    28,415.13x = 42,620.91 × 8,692.12
  4. Step 4: Simplify right side
    28,415.13x = 370,466,064.23
  5. Step 5: Solve for x
    x = 370,466,064.23/28,415.13
  6. Step 6: Final answer
    x = 13,037.63

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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.