Home / 1,418.24-2,128.58-553.16

Finding the Fourth Proportional to 1,418.24, 2,128.58 and 553.16

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Solution

The fourth proportional to 1,418.24, 2,128.58 and 553.16 is: 830.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.24 : 2,128.58 = 553.16 : x
  2. Step 2: Convert to fraction form
    1,418.24/2,128.58 = 553.16/x
  3. Step 3: Cross multiply
    1,418.24x = 2,128.58 × 553.16
  4. Step 4: Simplify right side
    1,418.24x = 1,177,431.90
  5. Step 5: Solve for x
    x = 1,177,431.90/1,418.24
  6. Step 6: Final answer
    x = 830.21

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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.