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Finding the Fourth Proportional to 3,221.50, 4,833.06 and 913

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Solution

The fourth proportional to 3,221.50, 4,833.06 and 913 is: 1,369.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,221.50 : 4,833.06 = 913 : x
  2. Step 2: Convert to fraction form
    3,221.50/4,833.06 = 913/x
  3. Step 3: Cross multiply
    3,221.50x = 4,833.06 × 913
  4. Step 4: Simplify right side
    3,221.50x = 4,412,583.78
  5. Step 5: Solve for x
    x = 4,412,583.78/3,221.50
  6. Step 6: Final answer
    x = 1,369.73

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1.5x scale

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.