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Finding the Fourth Proportional to 318.20, 477.60 and 272.60

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Solution

The fourth proportional to 318.20, 477.60 and 272.60 is: 409.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.20 : 477.60 = 272.60 : x
  2. Step 2: Convert to fraction form
    318.20/477.60 = 272.60/x
  3. Step 3: Cross multiply
    318.20x = 477.60 × 272.60
  4. Step 4: Simplify right side
    318.20x = 130,193.76
  5. Step 5: Solve for x
    x = 130,193.76/318.20
  6. Step 6: Final answer
    x = 409.16

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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.