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Finding the Fourth Proportional to 70.72, 98.02 and 66.66

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Solution

The fourth proportional to 70.72, 98.02 and 66.66 is: 92.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.72 : 98.02 = 66.66 : x
  2. Step 2: Convert to fraction form
    70.72/98.02 = 66.66/x
  3. Step 3: Cross multiply
    70.72x = 98.02 × 66.66
  4. Step 4: Simplify right side
    70.72x = 6,534.01
  5. Step 5: Solve for x
    x = 6,534.01/70.72
  6. Step 6: Final answer
    x = 92.39

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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.