Home / 28,236.88-38,971.56-15,665.68

Finding the Fourth Proportional to 28,236.88, 38,971.56 and 15,665.68

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Solution

The fourth proportional to 28,236.88, 38,971.56 and 15,665.68 is: 21,621.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,236.88 : 38,971.56 = 15,665.68 : x
  2. Step 2: Convert to fraction form
    28,236.88/38,971.56 = 15,665.68/x
  3. Step 3: Cross multiply
    28,236.88x = 38,971.56 × 15,665.68
  4. Step 4: Simplify right side
    28,236.88x = 610,515,988.06
  5. Step 5: Solve for x
    x = 610,515,988.06/28,236.88
  6. Step 6: Final answer
    x = 21,621.23

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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.