Home / 381,208.80-571,667.20-128,421.36

Finding the Fourth Proportional to 381,208.80, 571,667.20 and 128,421.36

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Solution

The fourth proportional to 381,208.80, 571,667.20 and 128,421.36 is: 192,582.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,208.80 : 571,667.20 = 128,421.36 : x
  2. Step 2: Convert to fraction form
    381,208.80/571,667.20 = 128,421.36/x
  3. Step 3: Cross multiply
    381,208.80x = 571,667.20 × 128,421.36
  4. Step 4: Simplify right side
    381,208.80x = 73,414,279,291.39
  5. Step 5: Solve for x
    x = 73,414,279,291.39/381,208.80
  6. Step 6: Final answer
    x = 192,582.86

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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.