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Finding the Fourth Proportional to 230.50, 345.80 and 76.42

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Solution

The fourth proportional to 230.50, 345.80 and 76.42 is: 114.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.50 : 345.80 = 76.42 : x
  2. Step 2: Convert to fraction form
    230.50/345.80 = 76.42/x
  3. Step 3: Cross multiply
    230.50x = 345.80 × 76.42
  4. Step 4: Simplify right side
    230.50x = 26,426.04
  5. Step 5: Solve for x
    x = 26,426.04/230.50
  6. Step 6: Final answer
    x = 114.65

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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.