Home / 1,215.56-1,821.92-485.34

Finding the Fourth Proportional to 1,215.56, 1,821.92 and 485.34

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Solution

The fourth proportional to 1,215.56, 1,821.92 and 485.34 is: 727.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.56 : 1,821.92 = 485.34 : x
  2. Step 2: Convert to fraction form
    1,215.56/1,821.92 = 485.34/x
  3. Step 3: Cross multiply
    1,215.56x = 1,821.92 × 485.34
  4. Step 4: Simplify right side
    1,215.56x = 884,248.23
  5. Step 5: Solve for x
    x = 884,248.23/1,215.56
  6. Step 6: Final answer
    x = 727.44

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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.