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Finding the Fourth Proportional to 306.30, 458.37 and 287.85

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Solution

The fourth proportional to 306.30, 458.37 and 287.85 is: 430.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.30 : 458.37 = 287.85 : x
  2. Step 2: Convert to fraction form
    306.30/458.37 = 287.85/x
  3. Step 3: Cross multiply
    306.30x = 458.37 × 287.85
  4. Step 4: Simplify right side
    306.30x = 131,941.80
  5. Step 5: Solve for x
    x = 131,941.80/306.30
  6. Step 6: Final answer
    x = 430.76

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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.