Home / 280,345.71-420,582.96-80,667.75

Finding the Fourth Proportional to 280,345.71, 420,582.96 and 80,667.75

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Solution

The fourth proportional to 280,345.71, 420,582.96 and 80,667.75 is: 121,020.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,345.71 : 420,582.96 = 80,667.75 : x
  2. Step 2: Convert to fraction form
    280,345.71/420,582.96 = 80,667.75/x
  3. Step 3: Cross multiply
    280,345.71x = 420,582.96 × 80,667.75
  4. Step 4: Simplify right side
    280,345.71x = 33,927,481,071.54
  5. Step 5: Solve for x
    x = 33,927,481,071.54/280,345.71
  6. Step 6: Final answer
    x = 121,020.15

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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.