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Finding the Fourth Proportional to 30.24, 45.38 and 20.76

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Solution

The fourth proportional to 30.24, 45.38 and 20.76 is: 31.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.24 : 45.38 = 20.76 : x
  2. Step 2: Convert to fraction form
    30.24/45.38 = 20.76/x
  3. Step 3: Cross multiply
    30.24x = 45.38 × 20.76
  4. Step 4: Simplify right side
    30.24x = 942.09
  5. Step 5: Solve for x
    x = 942.09/30.24
  6. Step 6: Final answer
    x = 31.15

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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.