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Finding the Fourth Proportional to 1,640.90, 2,462.25 and 775.19

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Solution

The fourth proportional to 1,640.90, 2,462.25 and 775.19 is: 1,163.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,640.90 : 2,462.25 = 775.19 : x
  2. Step 2: Convert to fraction form
    1,640.90/2,462.25 = 775.19/x
  3. Step 3: Cross multiply
    1,640.90x = 2,462.25 × 775.19
  4. Step 4: Simplify right side
    1,640.90x = 1,908,711.58
  5. Step 5: Solve for x
    x = 1,908,711.58/1,640.90
  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.