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Finding the Fourth Proportional to 66.88, 91.56 and 66.32

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Solution

The fourth proportional to 66.88, 91.56 and 66.32 is: 90.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.88 : 91.56 = 66.32 : x
  2. Step 2: Convert to fraction form
    66.88/91.56 = 66.32/x
  3. Step 3: Cross multiply
    66.88x = 91.56 × 66.32
  4. Step 4: Simplify right side
    66.88x = 6,072.26
  5. Step 5: Solve for x
    x = 6,072.26/66.88
  6. Step 6: Final answer
    x = 90.79

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.