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Finding the Fourth Proportional to 1,423.44, 2,131.92 and 990.92

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Solution

The fourth proportional to 1,423.44, 2,131.92 and 990.92 is: 1,484.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,423.44 : 2,131.92 = 990.92 : x
  2. Step 2: Convert to fraction form
    1,423.44/2,131.92 = 990.92/x
  3. Step 3: Cross multiply
    1,423.44x = 2,131.92 × 990.92
  4. Step 4: Simplify right side
    1,423.44x = 2,112,562.17
  5. Step 5: Solve for x
    x = 2,112,562.17/1,423.44
  6. Step 6: Final answer
    x = 1,484.12

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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.