Home / 1,215.10-1,823.11-485.19

Finding the Fourth Proportional to 1,215.10, 1,823.11 and 485.19

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Solution

The fourth proportional to 1,215.10, 1,823.11 and 485.19 is: 727.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.10 : 1,823.11 = 485.19 : x
  2. Step 2: Convert to fraction form
    1,215.10/1,823.11 = 485.19/x
  3. Step 3: Cross multiply
    1,215.10x = 1,823.11 × 485.19
  4. Step 4: Simplify right side
    1,215.10x = 884,553.53
  5. Step 5: Solve for x
    x = 884,553.53/1,215.10
  6. Step 6: Final answer
    x = 727.97

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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.