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Finding the Fourth Proportional to 628.66, 865.92 and 451.36

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Solution

The fourth proportional to 628.66, 865.92 and 451.36 is: 621.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.66 : 865.92 = 451.36 : x
  2. Step 2: Convert to fraction form
    628.66/865.92 = 451.36/x
  3. Step 3: Cross multiply
    628.66x = 865.92 × 451.36
  4. Step 4: Simplify right side
    628.66x = 390,841.65
  5. Step 5: Solve for x
    x = 390,841.65/628.66
  6. Step 6: Final answer
    x = 621.71

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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.