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Finding the Fourth Proportional to 231.60, 319.80 and 157.92

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Solution

The fourth proportional to 231.60, 319.80 and 157.92 is: 218.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.60 : 319.80 = 157.92 : x
  2. Step 2: Convert to fraction form
    231.60/319.80 = 157.92/x
  3. Step 3: Cross multiply
    231.60x = 319.80 × 157.92
  4. Step 4: Simplify right side
    231.60x = 50,502.82
  5. Step 5: Solve for x
    x = 50,502.82/231.60
  6. Step 6: Final answer
    x = 218.06

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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.