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Finding the Fourth Proportional to 749.28, 1,120.64 and 455.97

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Solution

The fourth proportional to 749.28, 1,120.64 and 455.97 is: 681.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.28 : 1,120.64 = 455.97 : x
  2. Step 2: Convert to fraction form
    749.28/1,120.64 = 455.97/x
  3. Step 3: Cross multiply
    749.28x = 1,120.64 × 455.97
  4. Step 4: Simplify right side
    749.28x = 510,975.94
  5. Step 5: Solve for x
    x = 510,975.94/749.28
  6. Step 6: Final answer
    x = 681.96

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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.