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Finding the Fourth Proportional to 749.20, 1,120.56 and 460.84

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Solution

The fourth proportional to 749.20, 1,120.56 and 460.84 is: 689.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.20 : 1,120.56 = 460.84 : x
  2. Step 2: Convert to fraction form
    749.20/1,120.56 = 460.84/x
  3. Step 3: Cross multiply
    749.20x = 1,120.56 × 460.84
  4. Step 4: Simplify right side
    749.20x = 516,398.87
  5. Step 5: Solve for x
    x = 516,398.87/749.20
  6. Step 6: Final answer
    x = 689.27

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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.