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Finding the Fourth Proportional to 40.45, 60.72 and 30.28

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Solution

The fourth proportional to 40.45, 60.72 and 30.28 is: 45.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.45 : 60.72 = 30.28 : x
  2. Step 2: Convert to fraction form
    40.45/60.72 = 30.28/x
  3. Step 3: Cross multiply
    40.45x = 60.72 × 30.28
  4. Step 4: Simplify right side
    40.45x = 1,838.60
  5. Step 5: Solve for x
    x = 1,838.60/40.45
  6. Step 6: Final answer
    x = 45.45

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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.