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Finding the Fourth Proportional to 3,887.95, 5,831.94 and 1,290.28

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Solution

The fourth proportional to 3,887.95, 5,831.94 and 1,290.28 is: 1,935.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,887.95 : 5,831.94 = 1,290.28 : x
  2. Step 2: Convert to fraction form
    3,887.95/5,831.94 = 1,290.28/x
  3. Step 3: Cross multiply
    3,887.95x = 5,831.94 × 1,290.28
  4. Step 4: Simplify right side
    3,887.95x = 7,524,835.54
  5. Step 5: Solve for x
    x = 7,524,835.54/3,887.95
  6. Step 6: Final answer
    x = 1,935.42

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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.