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Finding the Fourth Proportional to 305.58, 421.83 and 231.90

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Solution

The fourth proportional to 305.58, 421.83 and 231.90 is: 320.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.58 : 421.83 = 231.90 : x
  2. Step 2: Convert to fraction form
    305.58/421.83 = 231.90/x
  3. Step 3: Cross multiply
    305.58x = 421.83 × 231.90
  4. Step 4: Simplify right side
    305.58x = 97,822.38
  5. Step 5: Solve for x
    x = 97,822.38/305.58
  6. Step 6: Final answer
    x = 320.12

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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.