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Finding the Fourth Proportional to 339.80, 509.86 and 157.34

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Solution

The fourth proportional to 339.80, 509.86 and 157.34 is: 236.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.80 : 509.86 = 157.34 : x
  2. Step 2: Convert to fraction form
    339.80/509.86 = 157.34/x
  3. Step 3: Cross multiply
    339.80x = 509.86 × 157.34
  4. Step 4: Simplify right side
    339.80x = 80,221.37
  5. Step 5: Solve for x
    x = 80,221.37/339.80
  6. Step 6: Final answer
    x = 236.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.