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Finding the Fourth Proportional to 45.72, 68.06 and 45.45

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Solution

The fourth proportional to 45.72, 68.06 and 45.45 is: 67.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.72 : 68.06 = 45.45 : x
  2. Step 2: Convert to fraction form
    45.72/68.06 = 45.45/x
  3. Step 3: Cross multiply
    45.72x = 68.06 × 45.45
  4. Step 4: Simplify right side
    45.72x = 3,093.44
  5. Step 5: Solve for x
    x = 3,093.44/45.72
  6. Step 6: Final answer
    x = 67.66

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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.