Home / 3,390.90-5,084.76-1,311.89

Finding the Fourth Proportional to 3,390.90, 5,084.76 and 1,311.89

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Solution

The fourth proportional to 3,390.90, 5,084.76 and 1,311.89 is: 1,967.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,390.90 : 5,084.76 = 1,311.89 : x
  2. Step 2: Convert to fraction form
    3,390.90/5,084.76 = 1,311.89/x
  3. Step 3: Cross multiply
    3,390.90x = 5,084.76 × 1,311.89
  4. Step 4: Simplify right side
    3,390.90x = 6,670,617.91
  5. Step 5: Solve for x
    x = 6,670,617.91/3,390.90
  6. Step 6: Final answer
    x = 1,967.21

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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.