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Finding the Fourth Proportional to 520,076.70, 780,115.05 and 379,071.90

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Solution

The fourth proportional to 520,076.70, 780,115.05 and 379,071.90 is: 568,607.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,076.70 : 780,115.05 = 379,071.90 : x
  2. Step 2: Convert to fraction form
    520,076.70/780,115.05 = 379,071.90/x
  3. Step 3: Cross multiply
    520,076.70x = 780,115.05 × 379,071.90
  4. Step 4: Simplify right side
    520,076.70x = 295,719,694,222.10
  5. Step 5: Solve for x
    x = 295,719,694,222.10/520,076.70
  6. Step 6: Final answer
    x = 568,607.85

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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.