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Finding the Fourth Proportional to 1,221.40, 1,832.18 and 491.04

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Solution

The fourth proportional to 1,221.40, 1,832.18 and 491.04 is: 736.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.40 : 1,832.18 = 491.04 : x
  2. Step 2: Convert to fraction form
    1,221.40/1,832.18 = 491.04/x
  3. Step 3: Cross multiply
    1,221.40x = 1,832.18 × 491.04
  4. Step 4: Simplify right side
    1,221.40x = 899,673.67
  5. Step 5: Solve for x
    x = 899,673.67/1,221.40
  6. Step 6: Final answer
    x = 736.59

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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.