Home / 3,987.58-5,503.40-2,991.28

Finding the Fourth Proportional to 3,987.58, 5,503.40 and 2,991.28

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Solution

The fourth proportional to 3,987.58, 5,503.40 and 2,991.28 is: 4,128.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,987.58 : 5,503.40 = 2,991.28 : x
  2. Step 2: Convert to fraction form
    3,987.58/5,503.40 = 2,991.28/x
  3. Step 3: Cross multiply
    3,987.58x = 5,503.40 × 2,991.28
  4. Step 4: Simplify right side
    3,987.58x = 16,462,210.35
  5. Step 5: Solve for x
    x = 16,462,210.35/3,987.58
  6. Step 6: Final answer
    x = 4,128.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.