Home / 1,438.12-2,153.76-822.16

Finding the Fourth Proportional to 1,438.12, 2,153.76 and 822.16

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Solution

The fourth proportional to 1,438.12, 2,153.76 and 822.16 is: 1,231.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.12 : 2,153.76 = 822.16 : x
  2. Step 2: Convert to fraction form
    1,438.12/2,153.76 = 822.16/x
  3. Step 3: Cross multiply
    1,438.12x = 2,153.76 × 822.16
  4. Step 4: Simplify right side
    1,438.12x = 1,770,735.32
  5. Step 5: Solve for x
    x = 1,770,735.32/1,438.12
  6. Step 6: Final answer
    x = 1,231.28

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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.