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Finding the Fourth Proportional to 245.40, 338.54 and 157.92

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Solution

The fourth proportional to 245.40, 338.54 and 157.92 is: 217.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.40 : 338.54 = 157.92 : x
  2. Step 2: Convert to fraction form
    245.40/338.54 = 157.92/x
  3. Step 3: Cross multiply
    245.40x = 338.54 × 157.92
  4. Step 4: Simplify right side
    245.40x = 53,462.24
  5. Step 5: Solve for x
    x = 53,462.24/245.40
  6. Step 6: Final answer
    x = 217.86

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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.