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Finding the Fourth Proportional to 749.82, 1,125.96 and 621.03

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Solution

The fourth proportional to 749.82, 1,125.96 and 621.03 is: 932.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.82 : 1,125.96 = 621.03 : x
  2. Step 2: Convert to fraction form
    749.82/1,125.96 = 621.03/x
  3. Step 3: Cross multiply
    749.82x = 1,125.96 × 621.03
  4. Step 4: Simplify right side
    749.82x = 699,254.94
  5. Step 5: Solve for x
    x = 699,254.94/749.82
  6. Step 6: Final answer
    x = 932.56

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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.