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Finding the Fourth Proportional to 5,208.11, 7,811.91 and 1,920.98

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Solution

The fourth proportional to 5,208.11, 7,811.91 and 1,920.98 is: 2,881.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,208.11 : 7,811.91 = 1,920.98 : x
  2. Step 2: Convert to fraction form
    5,208.11/7,811.91 = 1,920.98/x
  3. Step 3: Cross multiply
    5,208.11x = 7,811.91 × 1,920.98
  4. Step 4: Simplify right side
    5,208.11x = 15,006,522.87
  5. Step 5: Solve for x
    x = 15,006,522.87/5,208.11
  6. Step 6: Final answer
    x = 2,881.38

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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.