Home / 21,223.06-31,790.84-12,431.32

Finding the Fourth Proportional to 21,223.06, 31,790.84 and 12,431.32

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Solution

The fourth proportional to 21,223.06, 31,790.84 and 12,431.32 is: 18,621.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,223.06 : 31,790.84 = 12,431.32 : x
  2. Step 2: Convert to fraction form
    21,223.06/31,790.84 = 12,431.32/x
  3. Step 3: Cross multiply
    21,223.06x = 31,790.84 × 12,431.32
  4. Step 4: Simplify right side
    21,223.06x = 395,202,105.11
  5. Step 5: Solve for x
    x = 395,202,105.11/21,223.06
  6. Step 6: Final answer
    x = 18,621.35

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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.