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Finding the Fourth Proportional to 456.89, 630.80 and 351.78

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Solution

The fourth proportional to 456.89, 630.80 and 351.78 is: 485.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.89 : 630.80 = 351.78 : x
  2. Step 2: Convert to fraction form
    456.89/630.80 = 351.78/x
  3. Step 3: Cross multiply
    456.89x = 630.80 × 351.78
  4. Step 4: Simplify right side
    456.89x = 221,898.79
  5. Step 5: Solve for x
    x = 221,898.79/456.89
  6. Step 6: Final answer
    x = 485.68

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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.