Home / 21,280.89-31,921.65-8,133.96

Finding the Fourth Proportional to 21,280.89, 31,921.65 and 8,133.96

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Solution

The fourth proportional to 21,280.89, 31,921.65 and 8,133.96 is: 12,201.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,280.89 : 31,921.65 = 8,133.96 : x
  2. Step 2: Convert to fraction form
    21,280.89/31,921.65 = 8,133.96/x
  3. Step 3: Cross multiply
    21,280.89x = 31,921.65 × 8,133.96
  4. Step 4: Simplify right side
    21,280.89x = 259,649,424.23
  5. Step 5: Solve for x
    x = 259,649,424.23/21,280.89
  6. Step 6: Final answer
    x = 12,201.06

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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.