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Finding the Fourth Proportional to 628.64, 867.12 and 395.36

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Solution

The fourth proportional to 628.64, 867.12 and 395.36 is: 545.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.64 : 867.12 = 395.36 : x
  2. Step 2: Convert to fraction form
    628.64/867.12 = 395.36/x
  3. Step 3: Cross multiply
    628.64x = 867.12 × 395.36
  4. Step 4: Simplify right side
    628.64x = 342,824.56
  5. Step 5: Solve for x
    x = 342,824.56/628.64
  6. Step 6: Final answer
    x = 545.34

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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.