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Finding the Fourth Proportional to 1,661.44, 2,490.72 and 976

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Solution

The fourth proportional to 1,661.44, 2,490.72 and 976 is: 1,463.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,661.44 : 2,490.72 = 976 : x
  2. Step 2: Convert to fraction form
    1,661.44/2,490.72 = 976/x
  3. Step 3: Cross multiply
    1,661.44x = 2,490.72 × 976
  4. Step 4: Simplify right side
    1,661.44x = 2,430,942.72
  5. Step 5: Solve for x
    x = 2,430,942.72/1,661.44
  6. Step 6: Final answer
    x = 1,463.15

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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.