Home / 20,988.25-28,969.89-16,768.69

Finding the Fourth Proportional to 20,988.25, 28,969.89 and 16,768.69

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Solution

The fourth proportional to 20,988.25, 28,969.89 and 16,768.69 is: 23,145.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,988.25 : 28,969.89 = 16,768.69 : x
  2. Step 2: Convert to fraction form
    20,988.25/28,969.89 = 16,768.69/x
  3. Step 3: Cross multiply
    20,988.25x = 28,969.89 × 16,768.69
  4. Step 4: Simplify right side
    20,988.25x = 485,787,104.74
  5. Step 5: Solve for x
    x = 485,787,104.74/20,988.25
  6. Step 6: Final answer
    x = 23,145.67

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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.