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Finding the Fourth Proportional to 628.66, 867.45 and 395.62

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Solution

The fourth proportional to 628.66, 867.45 and 395.62 is: 545.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.66 : 867.45 = 395.62 : x
  2. Step 2: Convert to fraction form
    628.66/867.45 = 395.62/x
  3. Step 3: Cross multiply
    628.66x = 867.45 × 395.62
  4. Step 4: Simplify right side
    628.66x = 343,180.57
  5. Step 5: Solve for x
    x = 343,180.57/628.66
  6. Step 6: Final answer
    x = 545.89

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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.