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Finding the Fourth Proportional to 318.76, 477.60 and 174.40

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Solution

The fourth proportional to 318.76, 477.60 and 174.40 is: 261.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.76 : 477.60 = 174.40 : x
  2. Step 2: Convert to fraction form
    318.76/477.60 = 174.40/x
  3. Step 3: Cross multiply
    318.76x = 477.60 × 174.40
  4. Step 4: Simplify right side
    318.76x = 83,293.44
  5. Step 5: Solve for x
    x = 83,293.44/318.76
  6. Step 6: Final answer
    x = 261.30

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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.