Home / 27,857.16-38,443.68-15,921

Finding the Fourth Proportional to 27,857.16, 38,443.68 and 15,921

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Solution

The fourth proportional to 27,857.16, 38,443.68 and 15,921 is: 21,971.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,857.16 : 38,443.68 = 15,921 : x
  2. Step 2: Convert to fraction form
    27,857.16/38,443.68 = 15,921/x
  3. Step 3: Cross multiply
    27,857.16x = 38,443.68 × 15,921
  4. Step 4: Simplify right side
    27,857.16x = 612,061,829.28
  5. Step 5: Solve for x
    x = 612,061,829.28/27,857.16
  6. Step 6: Final answer
    x = 21,971.44

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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.