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Finding the Fourth Proportional to 1,431.42, 2,145.63 and 699.99

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Solution

The fourth proportional to 1,431.42, 2,145.63 and 699.99 is: 1,049.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.42 : 2,145.63 = 699.99 : x
  2. Step 2: Convert to fraction form
    1,431.42/2,145.63 = 699.99/x
  3. Step 3: Cross multiply
    1,431.42x = 2,145.63 × 699.99
  4. Step 4: Simplify right side
    1,431.42x = 1,501,919.54
  5. Step 5: Solve for x
    x = 1,501,919.54/1,431.42
  6. Step 6: Final answer
    x = 1,049.25

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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.