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Finding the Fourth Proportional to 2,721.76, 4,083.36 and 990.56

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Solution

The fourth proportional to 2,721.76, 4,083.36 and 990.56 is: 1,486.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,721.76 : 4,083.36 = 990.56 : x
  2. Step 2: Convert to fraction form
    2,721.76/4,083.36 = 990.56/x
  3. Step 3: Cross multiply
    2,721.76x = 4,083.36 × 990.56
  4. Step 4: Simplify right side
    2,721.76x = 4,044,813.08
  5. Step 5: Solve for x
    x = 4,044,813.08/2,721.76
  6. Step 6: Final answer
    x = 1,486.10

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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.