Home / 21,281.94-31,921.70-8,128.35

Finding the Fourth Proportional to 21,281.94, 31,921.70 and 8,128.35

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Solution

The fourth proportional to 21,281.94, 31,921.70 and 8,128.35 is: 12,192.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,281.94 : 31,921.70 = 8,128.35 : x
  2. Step 2: Convert to fraction form
    21,281.94/31,921.70 = 8,128.35/x
  3. Step 3: Cross multiply
    21,281.94x = 31,921.70 × 8,128.35
  4. Step 4: Simplify right side
    21,281.94x = 259,470,709.55
  5. Step 5: Solve for x
    x = 259,470,709.55/21,281.94
  6. Step 6: Final answer
    x = 12,192.06

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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.