Home / 21,131.44-31,695.32-12,808.98

Finding the Fourth Proportional to 21,131.44, 31,695.32 and 12,808.98

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Solution

The fourth proportional to 21,131.44, 31,695.32 and 12,808.98 is: 19,212.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,131.44 : 31,695.32 = 12,808.98 : x
  2. Step 2: Convert to fraction form
    21,131.44/31,695.32 = 12,808.98/x
  3. Step 3: Cross multiply
    21,131.44x = 31,695.32 × 12,808.98
  4. Step 4: Simplify right side
    21,131.44x = 405,984,719.97
  5. Step 5: Solve for x
    x = 405,984,719.97/21,131.44
  6. Step 6: Final answer
    x = 19,212.35

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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.