Home / 21,939.54-30,284.43-12,987.12

Finding the Fourth Proportional to 21,939.54, 30,284.43 and 12,987.12

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Solution

The fourth proportional to 21,939.54, 30,284.43 and 12,987.12 is: 17,926.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,939.54 : 30,284.43 = 12,987.12 : x
  2. Step 2: Convert to fraction form
    21,939.54/30,284.43 = 12,987.12/x
  3. Step 3: Cross multiply
    21,939.54x = 30,284.43 × 12,987.12
  4. Step 4: Simplify right side
    21,939.54x = 393,307,526.54
  5. Step 5: Solve for x
    x = 393,307,526.54/21,939.54
  6. Step 6: Final answer
    x = 17,926.88

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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.