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Finding the Fourth Proportional to 1,125.78, 1,553.56 and 628.35

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Solution

The fourth proportional to 1,125.78, 1,553.56 and 628.35 is: 867.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.78 : 1,553.56 = 628.35 : x
  2. Step 2: Convert to fraction form
    1,125.78/1,553.56 = 628.35/x
  3. Step 3: Cross multiply
    1,125.78x = 1,553.56 × 628.35
  4. Step 4: Simplify right side
    1,125.78x = 976,179.43
  5. Step 5: Solve for x
    x = 976,179.43/1,125.78
  6. Step 6: Final answer
    x = 867.11

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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.