Home / 21,074.58-31,628.20-7,938.90

Finding the Fourth Proportional to 21,074.58, 31,628.20 and 7,938.90

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Solution

The fourth proportional to 21,074.58, 31,628.20 and 7,938.90 is: 11,914.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,074.58 : 31,628.20 = 7,938.90 : x
  2. Step 2: Convert to fraction form
    21,074.58/31,628.20 = 7,938.90/x
  3. Step 3: Cross multiply
    21,074.58x = 31,628.20 × 7,938.90
  4. Step 4: Simplify right side
    21,074.58x = 251,093,116.98
  5. Step 5: Solve for x
    x = 251,093,116.98/21,074.58
  6. Step 6: Final answer
    x = 11,914.50

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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.