Home / 20,991.18-28,962.27-11,916.54

Finding the Fourth Proportional to 20,991.18, 28,962.27 and 11,916.54

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Solution

The fourth proportional to 20,991.18, 28,962.27 and 11,916.54 is: 16,441.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.18 : 28,962.27 = 11,916.54 : x
  2. Step 2: Convert to fraction form
    20,991.18/28,962.27 = 11,916.54/x
  3. Step 3: Cross multiply
    20,991.18x = 28,962.27 × 11,916.54
  4. Step 4: Simplify right side
    20,991.18x = 345,130,048.95
  5. Step 5: Solve for x
    x = 345,130,048.95/20,991.18
  6. Step 6: Final answer
    x = 16,441.67

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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.