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Finding the Fourth Proportional to 297.20, 445.28 and 142.90

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Solution

The fourth proportional to 297.20, 445.28 and 142.90 is: 214.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    297.20 : 445.28 = 142.90 : x
  2. Step 2: Convert to fraction form
    297.20/445.28 = 142.90/x
  3. Step 3: Cross multiply
    297.20x = 445.28 × 142.90
  4. Step 4: Simplify right side
    297.20x = 63,630.51
  5. Step 5: Solve for x
    x = 63,630.51/297.20
  6. Step 6: Final answer
    x = 214.10

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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.