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Finding the Fourth Proportional to 39,825.40, 54,957.52 and 21,919.40

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Solution

The fourth proportional to 39,825.40, 54,957.52 and 21,919.40 is: 30,247.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,825.40 : 54,957.52 = 21,919.40 : x
  2. Step 2: Convert to fraction form
    39,825.40/54,957.52 = 21,919.40/x
  3. Step 3: Cross multiply
    39,825.40x = 54,957.52 × 21,919.40
  4. Step 4: Simplify right side
    39,825.40x = 1,204,635,863.89
  5. Step 5: Solve for x
    x = 1,204,635,863.89/39,825.40
  6. Step 6: Final answer
    x = 30,247.93

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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.