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Finding the Fourth Proportional to 628.57, 867.60 and 379.84

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Solution

The fourth proportional to 628.57, 867.60 and 379.84 is: 524.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.57 : 867.60 = 379.84 : x
  2. Step 2: Convert to fraction form
    628.57/867.60 = 379.84/x
  3. Step 3: Cross multiply
    628.57x = 867.60 × 379.84
  4. Step 4: Simplify right side
    628.57x = 329,549.18
  5. Step 5: Solve for x
    x = 329,549.18/628.57
  6. Step 6: Final answer
    x = 524.28

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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.