Home / 2,987.35-4,122.87-1,808.39

Finding the Fourth Proportional to 2,987.35, 4,122.87 and 1,808.39

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Solution

The fourth proportional to 2,987.35, 4,122.87 and 1,808.39 is: 2,495.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,987.35 : 4,122.87 = 1,808.39 : x
  2. Step 2: Convert to fraction form
    2,987.35/4,122.87 = 1,808.39/x
  3. Step 3: Cross multiply
    2,987.35x = 4,122.87 × 1,808.39
  4. Step 4: Simplify right side
    2,987.35x = 7,455,756.88
  5. Step 5: Solve for x
    x = 7,455,756.88/2,987.35
  6. Step 6: Final answer
    x = 2,495.78

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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.