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Finding the Fourth Proportional to 628.20, 864 and 579.60

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Solution

The fourth proportional to 628.20, 864 and 579.60 is: 797.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.20 : 864 = 579.60 : x
  2. Step 2: Convert to fraction form
    628.20/864 = 579.60/x
  3. Step 3: Cross multiply
    628.20x = 864 × 579.60
  4. Step 4: Simplify right side
    628.20x = 500,774.40
  5. Step 5: Solve for x
    x = 500,774.40/628.20
  6. Step 6: Final answer
    x = 797.16

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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.