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Finding the Fourth Proportional to 39,189, 54,079.24 and 21,283.52

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Solution

The fourth proportional to 39,189, 54,079.24 and 21,283.52 is: 29,370.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,189 : 54,079.24 = 21,283.52 : x
  2. Step 2: Convert to fraction form
    39,189/54,079.24 = 21,283.52/x
  3. Step 3: Cross multiply
    39,189x = 54,079.24 × 21,283.52
  4. Step 4: Simplify right side
    39,189x = 1,150,996,586.12
  5. Step 5: Solve for x
    x = 1,150,996,586.12/39,189
  6. Step 6: Final answer
    x = 29,370.40

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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.