Home / 81,043.12-121,619-28,452.76

Finding the Fourth Proportional to 81,043.12, 121,619 and 28,452.76

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Solution

The fourth proportional to 81,043.12, 121,619 and 28,452.76 is: 42,698.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,043.12 : 121,619 = 28,452.76 : x
  2. Step 2: Convert to fraction form
    81,043.12/121,619 = 28,452.76/x
  3. Step 3: Cross multiply
    81,043.12x = 121,619 × 28,452.76
  4. Step 4: Simplify right side
    81,043.12x = 3,460,396,218.44
  5. Step 5: Solve for x
    x = 3,460,396,218.44/81,043.12
  6. Step 6: Final answer
    x = 42,698.21

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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.