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Finding the Fourth Proportional to 1,220.20, 1,830.21 and 354.46

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Solution

The fourth proportional to 1,220.20, 1,830.21 and 354.46 is: 531.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.20 : 1,830.21 = 354.46 : x
  2. Step 2: Convert to fraction form
    1,220.20/1,830.21 = 354.46/x
  3. Step 3: Cross multiply
    1,220.20x = 1,830.21 × 354.46
  4. Step 4: Simplify right side
    1,220.20x = 648,736.24
  5. Step 5: Solve for x
    x = 648,736.24/1,220.20
  6. Step 6: Final answer
    x = 531.66

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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.