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Finding the Fourth Proportional to 628.20, 939.60 and 482.40

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Solution

The fourth proportional to 628.20, 939.60 and 482.40 is: 721.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.20 : 939.60 = 482.40 : x
  2. Step 2: Convert to fraction form
    628.20/939.60 = 482.40/x
  3. Step 3: Cross multiply
    628.20x = 939.60 × 482.40
  4. Step 4: Simplify right side
    628.20x = 453,263.04
  5. Step 5: Solve for x
    x = 453,263.04/628.20
  6. Step 6: Final answer
    x = 721.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.