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Finding the Fourth Proportional to 145.15, 200.32 and 120.55

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Solution

The fourth proportional to 145.15, 200.32 and 120.55 is: 166.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.15 : 200.32 = 120.55 : x
  2. Step 2: Convert to fraction form
    145.15/200.32 = 120.55/x
  3. Step 3: Cross multiply
    145.15x = 200.32 × 120.55
  4. Step 4: Simplify right side
    145.15x = 24,147.57
  5. Step 5: Solve for x
    x = 24,147.57/145.15
  6. Step 6: Final answer
    x = 166.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.