Home / 1,215.09-1,822.91-485.42

Finding the Fourth Proportional to 1,215.09, 1,822.91 and 485.42

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Solution

The fourth proportional to 1,215.09, 1,822.91 and 485.42 is: 728.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.09 : 1,822.91 = 485.42 : x
  2. Step 2: Convert to fraction form
    1,215.09/1,822.91 = 485.42/x
  3. Step 3: Cross multiply
    1,215.09x = 1,822.91 × 485.42
  4. Step 4: Simplify right side
    1,215.09x = 884,865.43
  5. Step 5: Solve for x
    x = 884,865.43/1,215.09
  6. Step 6: Final answer
    x = 728.23

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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.