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Finding the Fourth Proportional to 363.90, 545.64 and 120.36

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Solution

The fourth proportional to 363.90, 545.64 and 120.36 is: 180.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    363.90 : 545.64 = 120.36 : x
  2. Step 2: Convert to fraction form
    363.90/545.64 = 120.36/x
  3. Step 3: Cross multiply
    363.90x = 545.64 × 120.36
  4. Step 4: Simplify right side
    363.90x = 65,673.23
  5. Step 5: Solve for x
    x = 65,673.23/363.90
  6. Step 6: Final answer
    x = 180.47

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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.