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Finding the Fourth Proportional to 1,813.44, 2,718.72 and 1,128

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Solution

The fourth proportional to 1,813.44, 2,718.72 and 1,128 is: 1,691.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,813.44 : 2,718.72 = 1,128 : x
  2. Step 2: Convert to fraction form
    1,813.44/2,718.72 = 1,128/x
  3. Step 3: Cross multiply
    1,813.44x = 2,718.72 × 1,128
  4. Step 4: Simplify right side
    1,813.44x = 3,066,716.16
  5. Step 5: Solve for x
    x = 3,066,716.16/1,813.44
  6. Step 6: Final answer
    x = 1,691.10

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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.