Home / 3,987.29-5,980.89-1,390.22

Finding the Fourth Proportional to 3,987.29, 5,980.89 and 1,390.22

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Solution

The fourth proportional to 3,987.29, 5,980.89 and 1,390.22 is: 2,085.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,987.29 : 5,980.89 = 1,390.22 : x
  2. Step 2: Convert to fraction form
    3,987.29/5,980.89 = 1,390.22/x
  3. Step 3: Cross multiply
    3,987.29x = 5,980.89 × 1,390.22
  4. Step 4: Simplify right side
    3,987.29x = 8,314,752.90
  5. Step 5: Solve for x
    x = 8,314,752.90/3,987.29
  6. Step 6: Final answer
    x = 2,085.31

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1.5x scale

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.