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Finding the Fourth Proportional to 66.88, 92.19 and 53.11

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Solution

The fourth proportional to 66.88, 92.19 and 53.11 is: 73.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.88 : 92.19 = 53.11 : x
  2. Step 2: Convert to fraction form
    66.88/92.19 = 53.11/x
  3. Step 3: Cross multiply
    66.88x = 92.19 × 53.11
  4. Step 4: Simplify right side
    66.88x = 4,896.21
  5. Step 5: Solve for x
    x = 4,896.21/66.88
  6. Step 6: Final answer
    x = 73.21

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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.