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Finding the Fourth Proportional to 3,911.88, 5,868.30 and 1,315.08

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Solution

The fourth proportional to 3,911.88, 5,868.30 and 1,315.08 is: 1,972.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,911.88 : 5,868.30 = 1,315.08 : x
  2. Step 2: Convert to fraction form
    3,911.88/5,868.30 = 1,315.08/x
  3. Step 3: Cross multiply
    3,911.88x = 5,868.30 × 1,315.08
  4. Step 4: Simplify right side
    3,911.88x = 7,717,283.96
  5. Step 5: Solve for x
    x = 7,717,283.96/3,911.88
  6. Step 6: Final answer
    x = 1,972.78

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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.