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Finding the Fourth Proportional to 605,028.90, 909,511.65 and 428,756.70

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Solution

The fourth proportional to 605,028.90, 909,511.65 and 428,756.70 is: 644,529.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    605,028.90 : 909,511.65 = 428,756.70 : x
  2. Step 2: Convert to fraction form
    605,028.90/909,511.65 = 428,756.70/x
  3. Step 3: Cross multiply
    605,028.90x = 909,511.65 × 428,756.70
  4. Step 4: Simplify right side
    605,028.90x = 389,959,213,665.56
  5. Step 5: Solve for x
    x = 389,959,213,665.56/605,028.90
  6. Step 6: Final answer
    x = 644,529.90

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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.