Home / 20,986.56-31,478.80-7,837.92

Finding the Fourth Proportional to 20,986.56, 31,478.80 and 7,837.92

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Solution

The fourth proportional to 20,986.56, 31,478.80 and 7,837.92 is: 11,756.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,986.56 : 31,478.80 = 7,837.92 : x
  2. Step 2: Convert to fraction form
    20,986.56/31,478.80 = 7,837.92/x
  3. Step 3: Cross multiply
    20,986.56x = 31,478.80 × 7,837.92
  4. Step 4: Simplify right side
    20,986.56x = 246,728,316.10
  5. Step 5: Solve for x
    x = 246,728,316.10/20,986.56
  6. Step 6: Final answer
    x = 11,756.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.