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Finding the Fourth Proportional to 30.26, 45.28 and 28.64

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Solution

The fourth proportional to 30.26, 45.28 and 28.64 is: 42.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.26 : 45.28 = 28.64 : x
  2. Step 2: Convert to fraction form
    30.26/45.28 = 28.64/x
  3. Step 3: Cross multiply
    30.26x = 45.28 × 28.64
  4. Step 4: Simplify right side
    30.26x = 1,296.82
  5. Step 5: Solve for x
    x = 1,296.82/30.26
  6. Step 6: Final answer
    x = 42.86

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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.