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Finding the Fourth Proportional to 319.52, 478.99 and 189.20

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Solution

The fourth proportional to 319.52, 478.99 and 189.20 is: 283.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.52 : 478.99 = 189.20 : x
  2. Step 2: Convert to fraction form
    319.52/478.99 = 189.20/x
  3. Step 3: Cross multiply
    319.52x = 478.99 × 189.20
  4. Step 4: Simplify right side
    319.52x = 90,621.57
  5. Step 5: Solve for x
    x = 90,621.57/319.52
  6. Step 6: Final answer
    x = 283.62

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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.