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Finding the Fourth Proportional to 1,640.68, 2,459.82 and 774.28

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Solution

The fourth proportional to 1,640.68, 2,459.82 and 774.28 is: 1,160.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,640.68 : 2,459.82 = 774.28 : x
  2. Step 2: Convert to fraction form
    1,640.68/2,459.82 = 774.28/x
  3. Step 3: Cross multiply
    1,640.68x = 2,459.82 × 774.28
  4. Step 4: Simplify right side
    1,640.68x = 1,904,589.43
  5. Step 5: Solve for x
    x = 1,904,589.43/1,640.68
  6. Step 6: Final answer
    x = 1,160.85

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1.5x scale

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.