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Finding the Fourth Proportional to 1,290.44, 1,781.00 and 1,211.28

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Solution

The fourth proportional to 1,290.44, 1,781.00 and 1,211.28 is: 1,671.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.44 : 1,781.00 = 1,211.28 : x
  2. Step 2: Convert to fraction form
    1,290.44/1,781.00 = 1,211.28/x
  3. Step 3: Cross multiply
    1,290.44x = 1,781.00 × 1,211.28
  4. Step 4: Simplify right side
    1,290.44x = 2,157,288.20
  5. Step 5: Solve for x
    x = 2,157,288.20/1,290.44
  6. Step 6: Final answer
    x = 1,671.74

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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.