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Finding the Fourth Proportional to 13,989.70, 20,991.59 and 8,723.35

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Solution

The fourth proportional to 13,989.70, 20,991.59 and 8,723.35 is: 13,089.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,989.70 : 20,991.59 = 8,723.35 : x
  2. Step 2: Convert to fraction form
    13,989.70/20,991.59 = 8,723.35/x
  3. Step 3: Cross multiply
    13,989.70x = 20,991.59 × 8,723.35
  4. Step 4: Simplify right side
    13,989.70x = 183,116,986.63
  5. Step 5: Solve for x
    x = 183,116,986.63/13,989.70
  6. Step 6: Final answer
    x = 13,089.41

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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.