Home / 39,979.72-55,172.13-21,830.49

Finding the Fourth Proportional to 39,979.72, 55,172.13 and 21,830.49

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Solution

The fourth proportional to 39,979.72, 55,172.13 and 21,830.49 is: 30,126.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,979.72 : 55,172.13 = 21,830.49 : x
  2. Step 2: Convert to fraction form
    39,979.72/55,172.13 = 21,830.49/x
  3. Step 3: Cross multiply
    39,979.72x = 55,172.13 × 21,830.49
  4. Step 4: Simplify right side
    39,979.72x = 1,204,434,632.24
  5. Step 5: Solve for x
    x = 1,204,434,632.24/39,979.72
  6. Step 6: Final answer
    x = 30,126.14

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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.