Home / 20,891.21-31,321.23-12,569.28

Finding the Fourth Proportional to 20,891.21, 31,321.23 and 12,569.28

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Solution

The fourth proportional to 20,891.21, 31,321.23 and 12,569.28 is: 18,844.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,891.21 : 31,321.23 = 12,569.28 : x
  2. Step 2: Convert to fraction form
    20,891.21/31,321.23 = 12,569.28/x
  3. Step 3: Cross multiply
    20,891.21x = 31,321.23 × 12,569.28
  4. Step 4: Simplify right side
    20,891.21x = 393,685,090.36
  5. Step 5: Solve for x
    x = 393,685,090.36/20,891.21
  6. Step 6: Final answer
    x = 18,844.53

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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.