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Finding the Fourth Proportional to 2,007.90, 3,013.20 and 911.70

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Solution

The fourth proportional to 2,007.90, 3,013.20 and 911.70 is: 1,368.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,007.90 : 3,013.20 = 911.70 : x
  2. Step 2: Convert to fraction form
    2,007.90/3,013.20 = 911.70/x
  3. Step 3: Cross multiply
    2,007.90x = 3,013.20 × 911.70
  4. Step 4: Simplify right side
    2,007.90x = 2,747,134.44
  5. Step 5: Solve for x
    x = 2,747,134.44/2,007.90
  6. Step 6: Final answer
    x = 1,368.16

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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.