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Finding the Fourth Proportional to 66.58, 90.60 and 66.27

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Solution

The fourth proportional to 66.58, 90.60 and 66.27 is: 90.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.58 : 90.60 = 66.27 : x
  2. Step 2: Convert to fraction form
    66.58/90.60 = 66.27/x
  3. Step 3: Cross multiply
    66.58x = 90.60 × 66.27
  4. Step 4: Simplify right side
    66.58x = 6,004.06
  5. Step 5: Solve for x
    x = 6,004.06/66.58
  6. Step 6: Final answer
    x = 90.18

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.