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Finding the Fourth Proportional to 46.29, 69.45 and 28.20

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Solution

The fourth proportional to 46.29, 69.45 and 28.20 is: 42.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    46.29 : 69.45 = 28.20 : x
  2. Step 2: Convert to fraction form
    46.29/69.45 = 28.20/x
  3. Step 3: Cross multiply
    46.29x = 69.45 × 28.20
  4. Step 4: Simplify right side
    46.29x = 1,958.49
  5. Step 5: Solve for x
    x = 1,958.49/46.29
  6. Step 6: Final answer
    x = 42.31

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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.