Home / 428,309.57-642,465.81-108,461.33

Finding the Fourth Proportional to 428,309.57, 642,465.81 and 108,461.33

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Solution

The fourth proportional to 428,309.57, 642,465.81 and 108,461.33 is: 162,692.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,309.57 : 642,465.81 = 108,461.33 : x
  2. Step 2: Convert to fraction form
    428,309.57/642,465.81 = 108,461.33/x
  3. Step 3: Cross multiply
    428,309.57x = 642,465.81 × 108,461.33
  4. Step 4: Simplify right side
    428,309.57x = 69,682,695,429.05
  5. Step 5: Solve for x
    x = 69,682,695,429.05/428,309.57
  6. Step 6: Final answer
    x = 162,692.36

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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.