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Finding the Fourth Proportional to 30.49, 45.73 and 28.19

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Solution

The fourth proportional to 30.49, 45.73 and 28.19 is: 42.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.49 : 45.73 = 28.19 : x
  2. Step 2: Convert to fraction form
    30.49/45.73 = 28.19/x
  3. Step 3: Cross multiply
    30.49x = 45.73 × 28.19
  4. Step 4: Simplify right side
    30.49x = 1,289.13
  5. Step 5: Solve for x
    x = 1,289.13/30.49
  6. Step 6: Final answer
    x = 42.28

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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.