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Finding the Fourth Proportional to 628.40, 867.40 and 366.48

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Solution

The fourth proportional to 628.40, 867.40 and 366.48 is: 505.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.40 : 867.40 = 366.48 : x
  2. Step 2: Convert to fraction form
    628.40/867.40 = 366.48/x
  3. Step 3: Cross multiply
    628.40x = 867.40 × 366.48
  4. Step 4: Simplify right side
    628.40x = 317,884.75
  5. Step 5: Solve for x
    x = 317,884.75/628.40
  6. Step 6: Final answer
    x = 505.86

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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.