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Finding the Fourth Proportional to 1,904.38, 2,856.87 and 808.75

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Solution

The fourth proportional to 1,904.38, 2,856.87 and 808.75 is: 1,213.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,904.38 : 2,856.87 = 808.75 : x
  2. Step 2: Convert to fraction form
    1,904.38/2,856.87 = 808.75/x
  3. Step 3: Cross multiply
    1,904.38x = 2,856.87 × 808.75
  4. Step 4: Simplify right side
    1,904.38x = 2,310,493.61
  5. Step 5: Solve for x
    x = 2,310,493.61/1,904.38
  6. Step 6: Final answer
    x = 1,213.25

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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.