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Finding the Fourth Proportional to 749.75, 1,121.84 and 453.42

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Solution

The fourth proportional to 749.75, 1,121.84 and 453.42 is: 678.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.75 : 1,121.84 = 453.42 : x
  2. Step 2: Convert to fraction form
    749.75/1,121.84 = 453.42/x
  3. Step 3: Cross multiply
    749.75x = 1,121.84 × 453.42
  4. Step 4: Simplify right side
    749.75x = 508,662.43
  5. Step 5: Solve for x
    x = 508,662.43/749.75
  6. Step 6: Final answer
    x = 678.45

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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.