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Finding the Fourth Proportional to 455.86, 628.66 and 306.82

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Solution

The fourth proportional to 455.86, 628.66 and 306.82 is: 423.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.86 : 628.66 = 306.82 : x
  2. Step 2: Convert to fraction form
    455.86/628.66 = 306.82/x
  3. Step 3: Cross multiply
    455.86x = 628.66 × 306.82
  4. Step 4: Simplify right side
    455.86x = 192,885.46
  5. Step 5: Solve for x
    x = 192,885.46/455.86
  6. Step 6: Final answer
    x = 423.12

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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.