Home / 1,528.41-2,109.19-829.78

Finding the Fourth Proportional to 1,528.41, 2,109.19 and 829.78

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Solution

The fourth proportional to 1,528.41, 2,109.19 and 829.78 is: 1,145.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,528.41 : 2,109.19 = 829.78 : x
  2. Step 2: Convert to fraction form
    1,528.41/2,109.19 = 829.78/x
  3. Step 3: Cross multiply
    1,528.41x = 2,109.19 × 829.78
  4. Step 4: Simplify right side
    1,528.41x = 1,750,163.68
  5. Step 5: Solve for x
    x = 1,750,163.68/1,528.41
  6. Step 6: Final answer
    x = 1,145.09

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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.