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Finding the Fourth Proportional to 1,661.25, 2,292.53 and 998.67

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Solution

The fourth proportional to 1,661.25, 2,292.53 and 998.67 is: 1,378.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,661.25 : 2,292.53 = 998.67 : x
  2. Step 2: Convert to fraction form
    1,661.25/2,292.53 = 998.67/x
  3. Step 3: Cross multiply
    1,661.25x = 2,292.53 × 998.67
  4. Step 4: Simplify right side
    1,661.25x = 2,289,475.94
  5. Step 5: Solve for x
    x = 2,289,475.94/1,661.25
  6. Step 6: Final answer
    x = 1,378.16

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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.