Home / 21,020.75-31,531.26-5,438.51

Finding the Fourth Proportional to 21,020.75, 31,531.26 and 5,438.51

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Solution

The fourth proportional to 21,020.75, 31,531.26 and 5,438.51 is: 8,157.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,020.75 : 31,531.26 = 5,438.51 : x
  2. Step 2: Convert to fraction form
    21,020.75/31,531.26 = 5,438.51/x
  3. Step 3: Cross multiply
    21,020.75x = 31,531.26 × 5,438.51
  4. Step 4: Simplify right side
    21,020.75x = 171,483,072.82
  5. Step 5: Solve for x
    x = 171,483,072.82/21,020.75
  6. Step 6: Final answer
    x = 8,157.80

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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.