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Finding the Fourth Proportional to 245.19, 338.13 and 157.71

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Solution

The fourth proportional to 245.19, 338.13 and 157.71 is: 217.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.19 : 338.13 = 157.71 : x
  2. Step 2: Convert to fraction form
    245.19/338.13 = 157.71/x
  3. Step 3: Cross multiply
    245.19x = 338.13 × 157.71
  4. Step 4: Simplify right side
    245.19x = 53,326.48
  5. Step 5: Solve for x
    x = 53,326.48/245.19
  6. Step 6: Final answer
    x = 217.49

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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.