Home / 21,255.78-31,885.45-6,464.81

Finding the Fourth Proportional to 21,255.78, 31,885.45 and 6,464.81

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Solution

The fourth proportional to 21,255.78, 31,885.45 and 6,464.81 is: 9,697.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,255.78 : 31,885.45 = 6,464.81 : x
  2. Step 2: Convert to fraction form
    21,255.78/31,885.45 = 6,464.81/x
  3. Step 3: Cross multiply
    21,255.78x = 31,885.45 × 6,464.81
  4. Step 4: Simplify right side
    21,255.78x = 206,133,439.57
  5. Step 5: Solve for x
    x = 206,133,439.57/21,255.78
  6. Step 6: Final answer
    x = 9,697.76

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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.