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Finding the Fourth Proportional to 39,784.01, 54,903.67 and 21,879.67

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Solution

The fourth proportional to 39,784.01, 54,903.67 and 21,879.67 is: 30,194.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,784.01 : 54,903.67 = 21,879.67 : x
  2. Step 2: Convert to fraction form
    39,784.01/54,903.67 = 21,879.67/x
  3. Step 3: Cross multiply
    39,784.01x = 54,903.67 × 21,879.67
  4. Step 4: Simplify right side
    39,784.01x = 1,201,274,215.45
  5. Step 5: Solve for x
    x = 1,201,274,215.45/39,784.01
  6. Step 6: Final answer
    x = 30,194.90

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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.