Home / 3,909.78-5,860.62-1,311.84

Finding the Fourth Proportional to 3,909.78, 5,860.62 and 1,311.84

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Solution

The fourth proportional to 3,909.78, 5,860.62 and 1,311.84 is: 1,966.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,909.78 : 5,860.62 = 1,311.84 : x
  2. Step 2: Convert to fraction form
    3,909.78/5,860.62 = 1,311.84/x
  3. Step 3: Cross multiply
    3,909.78x = 5,860.62 × 1,311.84
  4. Step 4: Simplify right side
    3,909.78x = 7,688,195.74
  5. Step 5: Solve for x
    x = 7,688,195.74/3,909.78
  6. Step 6: Final answer
    x = 1,966.40

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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.