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Finding the Fourth Proportional to 1,876.78, 2,815.32 and 578.25

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Solution

The fourth proportional to 1,876.78, 2,815.32 and 578.25 is: 867.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,876.78 : 2,815.32 = 578.25 : x
  2. Step 2: Convert to fraction form
    1,876.78/2,815.32 = 578.25/x
  3. Step 3: Cross multiply
    1,876.78x = 2,815.32 × 578.25
  4. Step 4: Simplify right side
    1,876.78x = 1,627,960.96
  5. Step 5: Solve for x
    x = 1,627,960.96/1,876.78
  6. Step 6: Final answer
    x = 867.42

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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.