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Finding the Fourth Proportional to 245.72, 339 and 157.20

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Solution

The fourth proportional to 245.72, 339 and 157.20 is: 216.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.72 : 339 = 157.20 : x
  2. Step 2: Convert to fraction form
    245.72/339 = 157.20/x
  3. Step 3: Cross multiply
    245.72x = 339 × 157.20
  4. Step 4: Simplify right side
    245.72x = 53,290.80
  5. Step 5: Solve for x
    x = 53,290.80/245.72
  6. Step 6: Final answer
    x = 216.88

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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.