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Finding the Fourth Proportional to 1,490.47, 2,236.41 and 668.98

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Solution

The fourth proportional to 1,490.47, 2,236.41 and 668.98 is: 1,003.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,490.47 : 2,236.41 = 668.98 : x
  2. Step 2: Convert to fraction form
    1,490.47/2,236.41 = 668.98/x
  3. Step 3: Cross multiply
    1,490.47x = 2,236.41 × 668.98
  4. Step 4: Simplify right side
    1,490.47x = 1,496,113.56
  5. Step 5: Solve for x
    x = 1,496,113.56/1,490.47
  6. Step 6: Final answer
    x = 1,003.79

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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.