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Finding the Fourth Proportional to 318.92, 478.56 and 156.60

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Solution

The fourth proportional to 318.92, 478.56 and 156.60 is: 234.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.92 : 478.56 = 156.60 : x
  2. Step 2: Convert to fraction form
    318.92/478.56 = 156.60/x
  3. Step 3: Cross multiply
    318.92x = 478.56 × 156.60
  4. Step 4: Simplify right side
    318.92x = 74,942.50
  5. Step 5: Solve for x
    x = 74,942.50/318.92
  6. Step 6: Final answer
    x = 234.99

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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.