Home / 21,971.88-30,316.58-12,540.20

Finding the Fourth Proportional to 21,971.88, 30,316.58 and 12,540.20

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Solution

The fourth proportional to 21,971.88, 30,316.58 and 12,540.20 is: 17,302.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,971.88 : 30,316.58 = 12,540.20 : x
  2. Step 2: Convert to fraction form
    21,971.88/30,316.58 = 12,540.20/x
  3. Step 3: Cross multiply
    21,971.88x = 30,316.58 × 12,540.20
  4. Step 4: Simplify right side
    21,971.88x = 380,175,976.52
  5. Step 5: Solve for x
    x = 380,175,976.52/21,971.88
  6. Step 6: Final answer
    x = 17,302.84

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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.