Home / 3,987.15-5,980.77-1,390.11

Finding the Fourth Proportional to 3,987.15, 5,980.77 and 1,390.11

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Solution

The fourth proportional to 3,987.15, 5,980.77 and 1,390.11 is: 2,085.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,987.15 : 5,980.77 = 1,390.11 : x
  2. Step 2: Convert to fraction form
    3,987.15/5,980.77 = 1,390.11/x
  3. Step 3: Cross multiply
    3,987.15x = 5,980.77 × 1,390.11
  4. Step 4: Simplify right side
    3,987.15x = 8,313,928.18
  5. Step 5: Solve for x
    x = 8,313,928.18/3,987.15
  6. Step 6: Final answer
    x = 2,085.18

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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.