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Finding the Fourth Proportional to 1,221.62, 1,832.45 and 355.91

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Solution

The fourth proportional to 1,221.62, 1,832.45 and 355.91 is: 533.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.62 : 1,832.45 = 355.91 : x
  2. Step 2: Convert to fraction form
    1,221.62/1,832.45 = 355.91/x
  3. Step 3: Cross multiply
    1,221.62x = 1,832.45 × 355.91
  4. Step 4: Simplify right side
    1,221.62x = 652,176.34
  5. Step 5: Solve for x
    x = 652,176.34/1,221.62
  6. Step 6: Final answer
    x = 533.86

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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.