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Finding the Fourth Proportional to 628.70, 868.14 and 442.61

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Solution

The fourth proportional to 628.70, 868.14 and 442.61 is: 611.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.70 : 868.14 = 442.61 : x
  2. Step 2: Convert to fraction form
    628.70/868.14 = 442.61/x
  3. Step 3: Cross multiply
    628.70x = 868.14 × 442.61
  4. Step 4: Simplify right side
    628.70x = 384,247.45
  5. Step 5: Solve for x
    x = 384,247.45/628.70
  6. Step 6: Final answer
    x = 611.18

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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.