Home / 21,140.96-31,708.70-7,991.64

Finding the Fourth Proportional to 21,140.96, 31,708.70 and 7,991.64

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Solution

The fourth proportional to 21,140.96, 31,708.70 and 7,991.64 is: 11,986.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,140.96 : 31,708.70 = 7,991.64 : x
  2. Step 2: Convert to fraction form
    21,140.96/31,708.70 = 7,991.64/x
  3. Step 3: Cross multiply
    21,140.96x = 31,708.70 × 7,991.64
  4. Step 4: Simplify right side
    21,140.96x = 253,404,515.27
  5. Step 5: Solve for x
    x = 253,404,515.27/21,140.96
  6. Step 6: Final answer
    x = 11,986.42

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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.