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Finding the Fourth Proportional to 66.22, 90.83 and 64.62

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Solution

The fourth proportional to 66.22, 90.83 and 64.62 is: 88.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.22 : 90.83 = 64.62 : x
  2. Step 2: Convert to fraction form
    66.22/90.83 = 64.62/x
  3. Step 3: Cross multiply
    66.22x = 90.83 × 64.62
  4. Step 4: Simplify right side
    66.22x = 5,869.43
  5. Step 5: Solve for x
    x = 5,869.43/66.22
  6. Step 6: Final answer
    x = 88.64

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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.