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Finding the Fourth Proportional to 12,692.19, 17,512.79 and 8,215.32

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Solution

The fourth proportional to 12,692.19, 17,512.79 and 8,215.32 is: 11,335.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,692.19 : 17,512.79 = 8,215.32 : x
  2. Step 2: Convert to fraction form
    12,692.19/17,512.79 = 8,215.32/x
  3. Step 3: Cross multiply
    12,692.19x = 17,512.79 × 8,215.32
  4. Step 4: Simplify right side
    12,692.19x = 143,873,132.87
  5. Step 5: Solve for x
    x = 143,873,132.87/12,692.19
  6. Step 6: Final answer
    x = 11,335.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.