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Finding the Fourth Proportional to 1,424.40, 1,965.60 and 803.44

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Solution

The fourth proportional to 1,424.40, 1,965.60 and 803.44 is: 1,108.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,424.40 : 1,965.60 = 803.44 : x
  2. Step 2: Convert to fraction form
    1,424.40/1,965.60 = 803.44/x
  3. Step 3: Cross multiply
    1,424.40x = 1,965.60 × 803.44
  4. Step 4: Simplify right side
    1,424.40x = 1,579,241.66
  5. Step 5: Solve for x
    x = 1,579,241.66/1,424.40
  6. Step 6: Final answer
    x = 1,108.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.