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Finding the Fourth Proportional to 3,020.19, 4,530.11 and 911.78

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Solution

The fourth proportional to 3,020.19, 4,530.11 and 911.78 is: 1,367.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,020.19 : 4,530.11 = 911.78 : x
  2. Step 2: Convert to fraction form
    3,020.19/4,530.11 = 911.78/x
  3. Step 3: Cross multiply
    3,020.19x = 4,530.11 × 911.78
  4. Step 4: Simplify right side
    3,020.19x = 4,130,436.49
  5. Step 5: Solve for x
    x = 4,130,436.49/3,020.19
  6. Step 6: Final answer
    x = 1,367.61

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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.