Home / 3,990-5,975.71-3,851.58

Finding the Fourth Proportional to 3,990, 5,975.71 and 3,851.58

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Solution

The fourth proportional to 3,990, 5,975.71 and 3,851.58 is: 5,768.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990 : 5,975.71 = 3,851.58 : x
  2. Step 2: Convert to fraction form
    3,990/5,975.71 = 3,851.58/x
  3. Step 3: Cross multiply
    3,990x = 5,975.71 × 3,851.58
  4. Step 4: Simplify right side
    3,990x = 23,015,925.12
  5. Step 5: Solve for x
    x = 23,015,925.12/3,990
  6. Step 6: Final answer
    x = 5,768.40

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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.