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Finding the Fourth Proportional to 1,125.74, 1,553.45 and 628.40

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Solution

The fourth proportional to 1,125.74, 1,553.45 and 628.40 is: 867.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.74 : 1,553.45 = 628.40 : x
  2. Step 2: Convert to fraction form
    1,125.74/1,553.45 = 628.40/x
  3. Step 3: Cross multiply
    1,125.74x = 1,553.45 × 628.40
  4. Step 4: Simplify right side
    1,125.74x = 976,177.07
  5. Step 5: Solve for x
    x = 976,177.07/1,125.74
  6. Step 6: Final answer
    x = 867.15

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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.