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Finding the Fourth Proportional to 748.92, 1,121.55 and 618.12

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Solution

The fourth proportional to 748.92, 1,121.55 and 618.12 is: 925.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.92 : 1,121.55 = 618.12 : x
  2. Step 2: Convert to fraction form
    748.92/1,121.55 = 618.12/x
  3. Step 3: Cross multiply
    748.92x = 1,121.55 × 618.12
  4. Step 4: Simplify right side
    748.92x = 693,252.49
  5. Step 5: Solve for x
    x = 693,252.49/748.92
  6. Step 6: Final answer
    x = 925.67

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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.