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Finding the Fourth Proportional to 1,205.04, 1,661.28 and 811.44

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Solution

The fourth proportional to 1,205.04, 1,661.28 and 811.44 is: 1,118.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.04 : 1,661.28 = 811.44 : x
  2. Step 2: Convert to fraction form
    1,205.04/1,661.28 = 811.44/x
  3. Step 3: Cross multiply
    1,205.04x = 1,661.28 × 811.44
  4. Step 4: Simplify right side
    1,205.04x = 1,348,029.04
  5. Step 5: Solve for x
    x = 1,348,029.04/1,205.04
  6. Step 6: Final answer
    x = 1,118.66

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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.