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Finding the Fourth Proportional to 519,390.41, 780,455.57 and 279,681.55

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Solution

The fourth proportional to 519,390.41, 780,455.57 and 279,681.55 is: 420,260.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,390.41 : 780,455.57 = 279,681.55 : x
  2. Step 2: Convert to fraction form
    519,390.41/780,455.57 = 279,681.55/x
  3. Step 3: Cross multiply
    519,390.41x = 780,455.57 × 279,681.55
  4. Step 4: Simplify right side
    519,390.41x = 218,279,023,523.73
  5. Step 5: Solve for x
    x = 218,279,023,523.73/519,390.41
  6. Step 6: Final answer
    x = 420,260.02

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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.