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Finding the Fourth Proportional to 1,420.11, 2,128.91 and 553.82

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Solution

The fourth proportional to 1,420.11, 2,128.91 and 553.82 is: 830.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.11 : 2,128.91 = 553.82 : x
  2. Step 2: Convert to fraction form
    1,420.11/2,128.91 = 553.82/x
  3. Step 3: Cross multiply
    1,420.11x = 2,128.91 × 553.82
  4. Step 4: Simplify right side
    1,420.11x = 1,179,022.29
  5. Step 5: Solve for x
    x = 1,179,022.29/1,420.11
  6. Step 6: Final answer
    x = 830.23

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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.