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Finding the Fourth Proportional to 749.11, 1,120.93 and 455.54

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Solution

The fourth proportional to 749.11, 1,120.93 and 455.54 is: 681.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.11 : 1,120.93 = 455.54 : x
  2. Step 2: Convert to fraction form
    749.11/1,120.93 = 455.54/x
  3. Step 3: Cross multiply
    749.11x = 1,120.93 × 455.54
  4. Step 4: Simplify right side
    749.11x = 510,622.85
  5. Step 5: Solve for x
    x = 510,622.85/749.11
  6. Step 6: Final answer
    x = 681.64

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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.