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Finding the Fourth Proportional to 3,419.93, 5,129.90 and 822.87

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Solution

The fourth proportional to 3,419.93, 5,129.90 and 822.87 is: 1,234.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,419.93 : 5,129.90 = 822.87 : x
  2. Step 2: Convert to fraction form
    3,419.93/5,129.90 = 822.87/x
  3. Step 3: Cross multiply
    3,419.93x = 5,129.90 × 822.87
  4. Step 4: Simplify right side
    3,419.93x = 4,221,225.36
  5. Step 5: Solve for x
    x = 4,221,225.36/3,419.93
  6. Step 6: Final answer
    x = 1,234.30

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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.