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Finding the Fourth Proportional to 13,895.80, 20,839.98 and 3,899.96

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Solution

The fourth proportional to 13,895.80, 20,839.98 and 3,899.96 is: 5,848.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,895.80 : 20,839.98 = 3,899.96 : x
  2. Step 2: Convert to fraction form
    13,895.80/20,839.98 = 3,899.96/x
  3. Step 3: Cross multiply
    13,895.80x = 20,839.98 × 3,899.96
  4. Step 4: Simplify right side
    13,895.80x = 81,275,088.40
  5. Step 5: Solve for x
    x = 81,275,088.40/13,895.80
  6. Step 6: Final answer
    x = 5,848.90

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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.