Home / 20,805.70-31,216.41-12,491.51

Finding the Fourth Proportional to 20,805.70, 31,216.41 and 12,491.51

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Solution

The fourth proportional to 20,805.70, 31,216.41 and 12,491.51 is: 18,741.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,805.70 : 31,216.41 = 12,491.51 : x
  2. Step 2: Convert to fraction form
    20,805.70/31,216.41 = 12,491.51/x
  3. Step 3: Cross multiply
    20,805.70x = 31,216.41 × 12,491.51
  4. Step 4: Simplify right side
    20,805.70x = 389,940,058.66
  5. Step 5: Solve for x
    x = 389,940,058.66/20,805.70
  6. Step 6: Final answer
    x = 18,741.98

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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.