Home / 420,911.39-579,676.88-393,895.86

Finding the Fourth Proportional to 420,911.39, 579,676.88 and 393,895.86

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Solution

The fourth proportional to 420,911.39, 579,676.88 and 393,895.86 is: 542,471.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,911.39 : 579,676.88 = 393,895.86 : x
  2. Step 2: Convert to fraction form
    420,911.39/579,676.88 = 393,895.86/x
  3. Step 3: Cross multiply
    420,911.39x = 579,676.88 × 393,895.86
  4. Step 4: Simplify right side
    420,911.39x = 228,332,324,133.52
  5. Step 5: Solve for x
    x = 228,332,324,133.52/420,911.39
  6. Step 6: Final answer
    x = 542,471.25

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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.