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Finding the Fourth Proportional to 297.80, 446.70 and 189.80

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Solution

The fourth proportional to 297.80, 446.70 and 189.80 is: 284.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    297.80 : 446.70 = 189.80 : x
  2. Step 2: Convert to fraction form
    297.80/446.70 = 189.80/x
  3. Step 3: Cross multiply
    297.80x = 446.70 × 189.80
  4. Step 4: Simplify right side
    297.80x = 84,783.66
  5. Step 5: Solve for x
    x = 84,783.66/297.80
  6. Step 6: Final answer
    x = 284.70

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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.