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Finding the Fourth Proportional to 1,640.17, 2,461.47 and 775.09

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Solution

The fourth proportional to 1,640.17, 2,461.47 and 775.09 is: 1,163.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,640.17 : 2,461.47 = 775.09 : x
  2. Step 2: Convert to fraction form
    1,640.17/2,461.47 = 775.09/x
  3. Step 3: Cross multiply
    1,640.17x = 2,461.47 × 775.09
  4. Step 4: Simplify right side
    1,640.17x = 1,907,860.78
  5. Step 5: Solve for x
    x = 1,907,860.78/1,640.17
  6. Step 6: Final answer
    x = 1,163.21

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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.