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Finding the Fourth Proportional to 3,989.77, 5,975.54 and 1,911.25

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Solution

The fourth proportional to 3,989.77, 5,975.54 and 1,911.25 is: 2,862.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.77 : 5,975.54 = 1,911.25 : x
  2. Step 2: Convert to fraction form
    3,989.77/5,975.54 = 1,911.25/x
  3. Step 3: Cross multiply
    3,989.77x = 5,975.54 × 1,911.25
  4. Step 4: Simplify right side
    3,989.77x = 11,420,722.29
  5. Step 5: Solve for x
    x = 11,420,722.29/3,989.77
  6. Step 6: Final answer
    x = 2,862.50

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1.5x scale

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.