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Finding the Fourth Proportional to 20,640.99, 28,483.68 and 11,688.99

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Solution

The fourth proportional to 20,640.99, 28,483.68 and 11,688.99 is: 16,130.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,640.99 : 28,483.68 = 11,688.99 : x
  2. Step 2: Convert to fraction form
    20,640.99/28,483.68 = 11,688.99/x
  3. Step 3: Cross multiply
    20,640.99x = 28,483.68 × 11,688.99
  4. Step 4: Simplify right side
    20,640.99x = 332,945,450.68
  5. Step 5: Solve for x
    x = 332,945,450.68/20,640.99
  6. Step 6: Final answer
    x = 16,130.30

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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.