Home / 3,987.08-5,980.60-1,390

Finding the Fourth Proportional to 3,987.08, 5,980.60 and 1,390

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Solution

The fourth proportional to 3,987.08, 5,980.60 and 1,390 is: 2,084.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,987.08 : 5,980.60 = 1,390 : x
  2. Step 2: Convert to fraction form
    3,987.08/5,980.60 = 1,390/x
  3. Step 3: Cross multiply
    3,987.08x = 5,980.60 × 1,390
  4. Step 4: Simplify right side
    3,987.08x = 8,313,034.00
  5. Step 5: Solve for x
    x = 8,313,034.00/3,987.08
  6. Step 6: Final answer
    x = 2,084.99

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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.