Home / 428,582.33-643,228.20-215,411.34

Finding the Fourth Proportional to 428,582.33, 643,228.20 and 215,411.34

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Solution

The fourth proportional to 428,582.33, 643,228.20 and 215,411.34 is: 323,295.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,582.33 : 643,228.20 = 215,411.34 : x
  2. Step 2: Convert to fraction form
    428,582.33/643,228.20 = 215,411.34/x
  3. Step 3: Cross multiply
    428,582.33x = 643,228.20 × 215,411.34
  4. Step 4: Simplify right side
    428,582.33x = 138,558,647,410.73
  5. Step 5: Solve for x
    x = 138,558,647,410.73/428,582.33
  6. Step 6: Final answer
    x = 323,295.29

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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.