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Finding the Fourth Proportional to 520,091.90, 780,137.86 and 520,091.90

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Solution

The fourth proportional to 520,091.90, 780,137.86 and 520,091.90 is: 780,137.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,091.90 : 780,137.86 = 520,091.90 : x
  2. Step 2: Convert to fraction form
    520,091.90/780,137.86 = 520,091.90/x
  3. Step 3: Cross multiply
    520,091.90x = 780,137.86 × 520,091.90
  4. Step 4: Simplify right side
    520,091.90x = 405,743,381,869.33
  5. Step 5: Solve for x
    x = 405,743,381,869.33/520,091.90
  6. Step 6: Final answer
    x = 780,137.86

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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.