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Finding the Fourth Proportional to 39,898.50, 55,059.70 and 21,749.20

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Solution

The fourth proportional to 39,898.50, 55,059.70 and 21,749.20 is: 30,013.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,898.50 : 55,059.70 = 21,749.20 : x
  2. Step 2: Convert to fraction form
    39,898.50/55,059.70 = 21,749.20/x
  3. Step 3: Cross multiply
    39,898.50x = 55,059.70 × 21,749.20
  4. Step 4: Simplify right side
    39,898.50x = 1,197,504,427.24
  5. Step 5: Solve for x
    x = 1,197,504,427.24/39,898.50
  6. Step 6: Final answer
    x = 30,013.77

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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.