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Finding the Fourth Proportional to 2,878.32, 3,971.79 and 1,699.86

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Solution

The fourth proportional to 2,878.32, 3,971.79 and 1,699.86 is: 2,345.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,878.32 : 3,971.79 = 1,699.86 : x
  2. Step 2: Convert to fraction form
    2,878.32/3,971.79 = 1,699.86/x
  3. Step 3: Cross multiply
    2,878.32x = 3,971.79 × 1,699.86
  4. Step 4: Simplify right side
    2,878.32x = 6,751,486.95
  5. Step 5: Solve for x
    x = 6,751,486.95/2,878.32
  6. Step 6: Final answer
    x = 2,345.63

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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.