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Finding the Fourth Proportional to 319.15, 478.78 and 156.85

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Solution

The fourth proportional to 319.15, 478.78 and 156.85 is: 235.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.15 : 478.78 = 156.85 : x
  2. Step 2: Convert to fraction form
    319.15/478.78 = 156.85/x
  3. Step 3: Cross multiply
    319.15x = 478.78 × 156.85
  4. Step 4: Simplify right side
    319.15x = 75,095.05
  5. Step 5: Solve for x
    x = 75,095.05/319.15
  6. Step 6: Final answer
    x = 235.30

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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.