Home / 21,256.78-31,886.32-6,464.56

Finding the Fourth Proportional to 21,256.78, 31,886.32 and 6,464.56

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Solution

The fourth proportional to 21,256.78, 31,886.32 and 6,464.56 is: 9,697.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,256.78 : 31,886.32 = 6,464.56 : x
  2. Step 2: Convert to fraction form
    21,256.78/31,886.32 = 6,464.56/x
  3. Step 3: Cross multiply
    21,256.78x = 31,886.32 × 6,464.56
  4. Step 4: Simplify right side
    21,256.78x = 206,131,028.82
  5. Step 5: Solve for x
    x = 206,131,028.82/21,256.78
  6. Step 6: Final answer
    x = 9,697.19

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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.