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Finding the Fourth Proportional to 1,125.89, 1,553.72 and 628.64

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Solution

The fourth proportional to 1,125.89, 1,553.72 and 628.64 is: 867.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.89 : 1,553.72 = 628.64 : x
  2. Step 2: Convert to fraction form
    1,125.89/1,553.72 = 628.64/x
  3. Step 3: Cross multiply
    1,125.89x = 1,553.72 × 628.64
  4. Step 4: Simplify right side
    1,125.89x = 976,719.63
  5. Step 5: Solve for x
    x = 976,719.63/1,125.89
  6. Step 6: Final answer
    x = 867.51

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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.