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Finding the Fourth Proportional to 519,390.84, 780,456.20 and 279,681.97

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Solution

The fourth proportional to 519,390.84, 780,456.20 and 279,681.97 is: 420,260.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,390.84 : 780,456.20 = 279,681.97 : x
  2. Step 2: Convert to fraction form
    519,390.84/780,456.20 = 279,681.97/x
  3. Step 3: Cross multiply
    519,390.84x = 780,456.20 × 279,681.97
  4. Step 4: Simplify right side
    519,390.84x = 218,279,527,514.71
  5. Step 5: Solve for x
    x = 218,279,527,514.71/519,390.84
  6. Step 6: Final answer
    x = 420,260.64

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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.