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Finding the Fourth Proportional to 628.91, 867.53 and 395.63

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Solution

The fourth proportional to 628.91, 867.53 and 395.63 is: 545.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.91 : 867.53 = 395.63 : x
  2. Step 2: Convert to fraction form
    628.91/867.53 = 395.63/x
  3. Step 3: Cross multiply
    628.91x = 867.53 × 395.63
  4. Step 4: Simplify right side
    628.91x = 343,217.55
  5. Step 5: Solve for x
    x = 343,217.55/628.91
  6. Step 6: Final answer
    x = 545.74

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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.