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Finding the Fourth Proportional to 1,678.33, 2,517.75 and 856.16

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Solution

The fourth proportional to 1,678.33, 2,517.75 and 856.16 is: 1,284.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,678.33 : 2,517.75 = 856.16 : x
  2. Step 2: Convert to fraction form
    1,678.33/2,517.75 = 856.16/x
  3. Step 3: Cross multiply
    1,678.33x = 2,517.75 × 856.16
  4. Step 4: Simplify right side
    1,678.33x = 2,155,593.38
  5. Step 5: Solve for x
    x = 2,155,593.38/1,678.33
  6. Step 6: Final answer
    x = 1,284.37

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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.