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Finding the Fourth Proportional to 3,915.80, 5,871.78 and 1,939.15

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Solution

The fourth proportional to 3,915.80, 5,871.78 and 1,939.15 is: 2,907.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,915.80 : 5,871.78 = 1,939.15 : x
  2. Step 2: Convert to fraction form
    3,915.80/5,871.78 = 1,939.15/x
  3. Step 3: Cross multiply
    3,915.80x = 5,871.78 × 1,939.15
  4. Step 4: Simplify right side
    3,915.80x = 11,386,262.19
  5. Step 5: Solve for x
    x = 11,386,262.19/3,915.80
  6. Step 6: Final answer
    x = 2,907.77

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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.