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Finding the Fourth Proportional to 722.56, 1,081.68 and 491.68

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Solution

The fourth proportional to 722.56, 1,081.68 and 491.68 is: 736.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.56 : 1,081.68 = 491.68 : x
  2. Step 2: Convert to fraction form
    722.56/1,081.68 = 491.68/x
  3. Step 3: Cross multiply
    722.56x = 1,081.68 × 491.68
  4. Step 4: Simplify right side
    722.56x = 531,840.42
  5. Step 5: Solve for x
    x = 531,840.42/722.56
  6. Step 6: Final answer
    x = 736.05

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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.