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Finding the Fourth Proportional to 70.20, 97.20 and 66.60

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Solution

The fourth proportional to 70.20, 97.20 and 66.60 is: 92.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.20 : 97.20 = 66.60 : x
  2. Step 2: Convert to fraction form
    70.20/97.20 = 66.60/x
  3. Step 3: Cross multiply
    70.20x = 97.20 × 66.60
  4. Step 4: Simplify right side
    70.20x = 6,473.52
  5. Step 5: Solve for x
    x = 6,473.52/70.20
  6. Step 6: Final answer
    x = 92.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.