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Finding the Fourth Proportional to 5,205.81, 7,805.06 and 1,918.47

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Solution

The fourth proportional to 5,205.81, 7,805.06 and 1,918.47 is: 2,876.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,205.81 : 7,805.06 = 1,918.47 : x
  2. Step 2: Convert to fraction form
    5,205.81/7,805.06 = 1,918.47/x
  3. Step 3: Cross multiply
    5,205.81x = 7,805.06 × 1,918.47
  4. Step 4: Simplify right side
    5,205.81x = 14,973,773.46
  5. Step 5: Solve for x
    x = 14,973,773.46/5,205.81
  6. Step 6: Final answer
    x = 2,876.36

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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.