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Finding the Fourth Proportional to 319.36, 478.56 and 156.84

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Solution

The fourth proportional to 319.36, 478.56 and 156.84 is: 235.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.36 : 478.56 = 156.84 : x
  2. Step 2: Convert to fraction form
    319.36/478.56 = 156.84/x
  3. Step 3: Cross multiply
    319.36x = 478.56 × 156.84
  4. Step 4: Simplify right side
    319.36x = 75,057.35
  5. Step 5: Solve for x
    x = 75,057.35/319.36
  6. Step 6: Final answer
    x = 235.02

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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.