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Finding the Fourth Proportional to 3,421.07, 5,131.60 and 824

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Solution

The fourth proportional to 3,421.07, 5,131.60 and 824 is: 1,236.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,421.07 : 5,131.60 = 824 : x
  2. Step 2: Convert to fraction form
    3,421.07/5,131.60 = 824/x
  3. Step 3: Cross multiply
    3,421.07x = 5,131.60 × 824
  4. Step 4: Simplify right side
    3,421.07x = 4,228,434.28
  5. Step 5: Solve for x
    x = 4,228,434.28/3,421.07
  6. Step 6: Final answer
    x = 1,236.00

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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.