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Finding the Fourth Proportional to 30.28, 45.13 and 28.48

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Solution

The fourth proportional to 30.28, 45.13 and 28.48 is: 42.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.28 : 45.13 = 28.48 : x
  2. Step 2: Convert to fraction form
    30.28/45.13 = 28.48/x
  3. Step 3: Cross multiply
    30.28x = 45.13 × 28.48
  4. Step 4: Simplify right side
    30.28x = 1,285.30
  5. Step 5: Solve for x
    x = 1,285.30/30.28
  6. Step 6: Final answer
    x = 42.45

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.