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Finding the Fourth Proportional to 66.12, 91.86 and 65.46

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Solution

The fourth proportional to 66.12, 91.86 and 65.46 is: 90.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.12 : 91.86 = 65.46 : x
  2. Step 2: Convert to fraction form
    66.12/91.86 = 65.46/x
  3. Step 3: Cross multiply
    66.12x = 91.86 × 65.46
  4. Step 4: Simplify right side
    66.12x = 6,013.16
  5. Step 5: Solve for x
    x = 6,013.16/66.12
  6. Step 6: Final answer
    x = 90.94

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.