Home / 21,985.97-30,342.12-12,422.54

Finding the Fourth Proportional to 21,985.97, 30,342.12 and 12,422.54

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Solution

The fourth proportional to 21,985.97, 30,342.12 and 12,422.54 is: 17,143.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,985.97 : 30,342.12 = 12,422.54 : x
  2. Step 2: Convert to fraction form
    21,985.97/30,342.12 = 12,422.54/x
  3. Step 3: Cross multiply
    21,985.97x = 30,342.12 × 12,422.54
  4. Step 4: Simplify right side
    21,985.97x = 376,926,199.38
  5. Step 5: Solve for x
    x = 376,926,199.38/21,985.97
  6. Step 6: Final answer
    x = 17,143.94

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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.