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Finding the Fourth Proportional to 245.17, 338.19 and 145.55

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Solution

The fourth proportional to 245.17, 338.19 and 145.55 is: 200.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.17 : 338.19 = 145.55 : x
  2. Step 2: Convert to fraction form
    245.17/338.19 = 145.55/x
  3. Step 3: Cross multiply
    245.17x = 338.19 × 145.55
  4. Step 4: Simplify right side
    245.17x = 49,224.67
  5. Step 5: Solve for x
    x = 49,224.67/245.17
  6. Step 6: Final answer
    x = 200.78

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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.