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Finding the Fourth Proportional to 1,990.94, 2,987.18 and 821.49

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Solution

The fourth proportional to 1,990.94, 2,987.18 and 821.49 is: 1,232.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.94 : 2,987.18 = 821.49 : x
  2. Step 2: Convert to fraction form
    1,990.94/2,987.18 = 821.49/x
  3. Step 3: Cross multiply
    1,990.94x = 2,987.18 × 821.49
  4. Step 4: Simplify right side
    1,990.94x = 2,453,934.39
  5. Step 5: Solve for x
    x = 2,453,934.39/1,990.94
  6. Step 6: Final answer
    x = 1,232.55

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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.