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Finding the Fourth Proportional to 13,285.80, 19,928.70 and 11,171.70

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Solution

The fourth proportional to 13,285.80, 19,928.70 and 11,171.70 is: 16,757.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,285.80 : 19,928.70 = 11,171.70 : x
  2. Step 2: Convert to fraction form
    13,285.80/19,928.70 = 11,171.70/x
  3. Step 3: Cross multiply
    13,285.80x = 19,928.70 × 11,171.70
  4. Step 4: Simplify right side
    13,285.80x = 222,637,457.79
  5. Step 5: Solve for x
    x = 222,637,457.79/13,285.80
  6. Step 6: Final answer
    x = 16,757.55

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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.