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Finding the Fourth Proportional to 1,443.15, 1,991.55 and 813.68

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Solution

The fourth proportional to 1,443.15, 1,991.55 and 813.68 is: 1,122.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,443.15 : 1,991.55 = 813.68 : x
  2. Step 2: Convert to fraction form
    1,443.15/1,991.55 = 813.68/x
  3. Step 3: Cross multiply
    1,443.15x = 1,991.55 × 813.68
  4. Step 4: Simplify right side
    1,443.15x = 1,620,473.26
  5. Step 5: Solve for x
    x = 1,620,473.26/1,443.15
  6. Step 6: Final answer
    x = 1,122.87

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1.5x scale

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.