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Finding the Fourth Proportional to 319.05, 478.20 and 189.11

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Solution

The fourth proportional to 319.05, 478.20 and 189.11 is: 283.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.05 : 478.20 = 189.11 : x
  2. Step 2: Convert to fraction form
    319.05/478.20 = 189.11/x
  3. Step 3: Cross multiply
    319.05x = 478.20 × 189.11
  4. Step 4: Simplify right side
    319.05x = 90,432.40
  5. Step 5: Solve for x
    x = 90,432.40/319.05
  6. Step 6: Final answer
    x = 283.44

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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.