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Finding the Fourth Proportional to 66.35, 99.60 and 61.56

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Solution

The fourth proportional to 66.35, 99.60 and 61.56 is: 92.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.35 : 99.60 = 61.56 : x
  2. Step 2: Convert to fraction form
    66.35/99.60 = 61.56/x
  3. Step 3: Cross multiply
    66.35x = 99.60 × 61.56
  4. Step 4: Simplify right side
    66.35x = 6,131.43
  5. Step 5: Solve for x
    x = 6,131.43/66.35
  6. Step 6: Final answer
    x = 92.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.