Home / 39,840.79-54,979.51-21,936.09

Finding the Fourth Proportional to 39,840.79, 54,979.51 and 21,936.09

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Solution

The fourth proportional to 39,840.79, 54,979.51 and 21,936.09 is: 30,271.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,840.79 : 54,979.51 = 21,936.09 : x
  2. Step 2: Convert to fraction form
    39,840.79/54,979.51 = 21,936.09/x
  3. Step 3: Cross multiply
    39,840.79x = 54,979.51 × 21,936.09
  4. Step 4: Simplify right side
    39,840.79x = 1,206,035,479.52
  5. Step 5: Solve for x
    x = 1,206,035,479.52/39,840.79
  6. Step 6: Final answer
    x = 30,271.37

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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.