Home / 20,986.99-28,964.09-15,672.58

Finding the Fourth Proportional to 20,986.99, 28,964.09 and 15,672.58

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Solution

The fourth proportional to 20,986.99, 28,964.09 and 15,672.58 is: 21,629.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,986.99 : 28,964.09 = 15,672.58 : x
  2. Step 2: Convert to fraction form
    20,986.99/28,964.09 = 15,672.58/x
  3. Step 3: Cross multiply
    20,986.99x = 28,964.09 × 15,672.58
  4. Step 4: Simplify right side
    20,986.99x = 453,941,839.73
  5. Step 5: Solve for x
    x = 453,941,839.73/20,986.99
  6. Step 6: Final answer
    x = 21,629.68

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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.