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Finding the Fourth Proportional to 2,143.94, 3,216.99 and 990.50

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Solution

The fourth proportional to 2,143.94, 3,216.99 and 990.50 is: 1,486.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,143.94 : 3,216.99 = 990.50 : x
  2. Step 2: Convert to fraction form
    2,143.94/3,216.99 = 990.50/x
  3. Step 3: Cross multiply
    2,143.94x = 3,216.99 × 990.50
  4. Step 4: Simplify right side
    2,143.94x = 3,186,428.60
  5. Step 5: Solve for x
    x = 3,186,428.60/2,143.94
  6. Step 6: Final answer
    x = 1,486.25

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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.