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Finding the Fourth Proportional to 1,420.96, 2,131.41 and 555.28

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Solution

The fourth proportional to 1,420.96, 2,131.41 and 555.28 is: 832.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.96 : 2,131.41 = 555.28 : x
  2. Step 2: Convert to fraction form
    1,420.96/2,131.41 = 555.28/x
  3. Step 3: Cross multiply
    1,420.96x = 2,131.41 × 555.28
  4. Step 4: Simplify right side
    1,420.96x = 1,183,529.34
  5. Step 5: Solve for x
    x = 1,183,529.34/1,420.96
  6. Step 6: Final answer
    x = 832.91

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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.