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Finding the Fourth Proportional to 45.64, 68.72 and 38

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Solution

The fourth proportional to 45.64, 68.72 and 38 is: 57.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.64 : 68.72 = 38 : x
  2. Step 2: Convert to fraction form
    45.64/68.72 = 38/x
  3. Step 3: Cross multiply
    45.64x = 68.72 × 38
  4. Step 4: Simplify right side
    45.64x = 2,611.36
  5. Step 5: Solve for x
    x = 2,611.36/45.64
  6. Step 6: Final answer
    x = 57.22

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.