Home / 1,215.48-1,678.41-823.62

Finding the Fourth Proportional to 1,215.48, 1,678.41 and 823.62

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Solution

The fourth proportional to 1,215.48, 1,678.41 and 823.62 is: 1,137.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.48 : 1,678.41 = 823.62 : x
  2. Step 2: Convert to fraction form
    1,215.48/1,678.41 = 823.62/x
  3. Step 3: Cross multiply
    1,215.48x = 1,678.41 × 823.62
  4. Step 4: Simplify right side
    1,215.48x = 1,382,372.04
  5. Step 5: Solve for x
    x = 1,382,372.04/1,215.48
  6. Step 6: Final answer
    x = 1,137.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.