Home / 3,108.78-4,290.05-1,782.47

Finding the Fourth Proportional to 3,108.78, 4,290.05 and 1,782.47

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Solution

The fourth proportional to 3,108.78, 4,290.05 and 1,782.47 is: 2,459.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,108.78 : 4,290.05 = 1,782.47 : x
  2. Step 2: Convert to fraction form
    3,108.78/4,290.05 = 1,782.47/x
  3. Step 3: Cross multiply
    3,108.78x = 4,290.05 × 1,782.47
  4. Step 4: Simplify right side
    3,108.78x = 7,646,900.60
  5. Step 5: Solve for x
    x = 7,646,900.60/3,108.78
  6. Step 6: Final answer
    x = 2,459.78

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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.