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Finding the Fourth Proportional to 2,020.90, 3,029.10 and 787.90

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Solution

The fourth proportional to 2,020.90, 3,029.10 and 787.90 is: 1,180.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,020.90 : 3,029.10 = 787.90 : x
  2. Step 2: Convert to fraction form
    2,020.90/3,029.10 = 787.90/x
  3. Step 3: Cross multiply
    2,020.90x = 3,029.10 × 787.90
  4. Step 4: Simplify right side
    2,020.90x = 2,386,627.89
  5. Step 5: Solve for x
    x = 2,386,627.89/2,020.90
  6. Step 6: Final answer
    x = 1,180.97

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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.