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Finding the Fourth Proportional to 1,420.75, 2,131.64 and 496.56

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Solution

The fourth proportional to 1,420.75, 2,131.64 and 496.56 is: 745.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.75 : 2,131.64 = 496.56 : x
  2. Step 2: Convert to fraction form
    1,420.75/2,131.64 = 496.56/x
  3. Step 3: Cross multiply
    1,420.75x = 2,131.64 × 496.56
  4. Step 4: Simplify right side
    1,420.75x = 1,058,494.53
  5. Step 5: Solve for x
    x = 1,058,494.53/1,420.75
  6. Step 6: Final answer
    x = 745.02

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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.