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Finding the Fourth Proportional to 13,692.21, 18,895.55 and 8,389.95

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Solution

The fourth proportional to 13,692.21, 18,895.55 and 8,389.95 is: 11,578.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,692.21 : 18,895.55 = 8,389.95 : x
  2. Step 2: Convert to fraction form
    13,692.21/18,895.55 = 8,389.95/x
  3. Step 3: Cross multiply
    13,692.21x = 18,895.55 × 8,389.95
  4. Step 4: Simplify right side
    13,692.21x = 158,532,677.77
  5. Step 5: Solve for x
    x = 158,532,677.77/13,692.21
  6. Step 6: Final answer
    x = 11,578.31

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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.