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Finding the Fourth Proportional to 45.21, 62.43 and 30.69

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Solution

The fourth proportional to 45.21, 62.43 and 30.69 is: 42.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.21 : 62.43 = 30.69 : x
  2. Step 2: Convert to fraction form
    45.21/62.43 = 30.69/x
  3. Step 3: Cross multiply
    45.21x = 62.43 × 30.69
  4. Step 4: Simplify right side
    45.21x = 1,915.98
  5. Step 5: Solve for x
    x = 1,915.98/45.21
  6. Step 6: Final answer
    x = 42.38

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.