Home / 1,678.83-2,514.57-811.32

Finding the Fourth Proportional to 1,678.83, 2,514.57 and 811.32

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Solution

The fourth proportional to 1,678.83, 2,514.57 and 811.32 is: 1,215.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,678.83 : 2,514.57 = 811.32 : x
  2. Step 2: Convert to fraction form
    1,678.83/2,514.57 = 811.32/x
  3. Step 3: Cross multiply
    1,678.83x = 2,514.57 × 811.32
  4. Step 4: Simplify right side
    1,678.83x = 2,040,120.93
  5. Step 5: Solve for x
    x = 2,040,120.93/1,678.83
  6. Step 6: Final answer
    x = 1,215.20

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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.