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Finding the Fourth Proportional to 749.05, 1,121.74 and 618.25

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Solution

The fourth proportional to 749.05, 1,121.74 and 618.25 is: 925.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.05 : 1,121.74 = 618.25 : x
  2. Step 2: Convert to fraction form
    749.05/1,121.74 = 618.25/x
  3. Step 3: Cross multiply
    749.05x = 1,121.74 × 618.25
  4. Step 4: Simplify right side
    749.05x = 693,515.76
  5. Step 5: Solve for x
    x = 693,515.76/749.05
  6. Step 6: Final answer
    x = 925.86

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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.