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Finding the Fourth Proportional to 1,640.86, 2,460.07 and 774.56

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Solution

The fourth proportional to 1,640.86, 2,460.07 and 774.56 is: 1,161.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,640.86 : 2,460.07 = 774.56 : x
  2. Step 2: Convert to fraction form
    1,640.86/2,460.07 = 774.56/x
  3. Step 3: Cross multiply
    1,640.86x = 2,460.07 × 774.56
  4. Step 4: Simplify right side
    1,640.86x = 1,905,478.94
  5. Step 5: Solve for x
    x = 1,905,478.94/1,640.86
  6. Step 6: Final answer
    x = 1,161.27

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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.