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Finding the Fourth Proportional to 628.91, 867.79 and 395.87

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Solution

The fourth proportional to 628.91, 867.79 and 395.87 is: 546.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.91 : 867.79 = 395.87 : x
  2. Step 2: Convert to fraction form
    628.91/867.79 = 395.87/x
  3. Step 3: Cross multiply
    628.91x = 867.79 × 395.87
  4. Step 4: Simplify right side
    628.91x = 343,532.03
  5. Step 5: Solve for x
    x = 343,532.03/628.91
  6. Step 6: Final answer
    x = 546.23

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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.