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Finding the Fourth Proportional to 3,220.88, 4,831.73 and 912.38

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Solution

The fourth proportional to 3,220.88, 4,831.73 and 912.38 is: 1,368.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,220.88 : 4,831.73 = 912.38 : x
  2. Step 2: Convert to fraction form
    3,220.88/4,831.73 = 912.38/x
  3. Step 3: Cross multiply
    3,220.88x = 4,831.73 × 912.38
  4. Step 4: Simplify right side
    3,220.88x = 4,408,345.10
  5. Step 5: Solve for x
    x = 4,408,345.10/3,220.88
  6. Step 6: Final answer
    x = 1,368.68

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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.