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Finding the Fourth Proportional to 66.44, 91.73 and 45.72

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Solution

The fourth proportional to 66.44, 91.73 and 45.72 is: 63.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.44 : 91.73 = 45.72 : x
  2. Step 2: Convert to fraction form
    66.44/91.73 = 45.72/x
  3. Step 3: Cross multiply
    66.44x = 91.73 × 45.72
  4. Step 4: Simplify right side
    66.44x = 4,194.01
  5. Step 5: Solve for x
    x = 4,194.01/66.44
  6. Step 6: Final answer
    x = 63.12

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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.