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Finding the Fourth Proportional to 628.67, 867.81 and 612.11

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Solution

The fourth proportional to 628.67, 867.81 and 612.11 is: 844.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.67 : 867.81 = 612.11 : x
  2. Step 2: Convert to fraction form
    628.67/867.81 = 612.11/x
  3. Step 3: Cross multiply
    628.67x = 867.81 × 612.11
  4. Step 4: Simplify right side
    628.67x = 531,190.84
  5. Step 5: Solve for x
    x = 531,190.84/628.67
  6. Step 6: Final answer
    x = 844.95

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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.