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Finding the Fourth Proportional to 70.44, 97.02 and 66.21

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Solution

The fourth proportional to 70.44, 97.02 and 66.21 is: 91.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.44 : 97.02 = 66.21 : x
  2. Step 2: Convert to fraction form
    70.44/97.02 = 66.21/x
  3. Step 3: Cross multiply
    70.44x = 97.02 × 66.21
  4. Step 4: Simplify right side
    70.44x = 6,423.69
  5. Step 5: Solve for x
    x = 6,423.69/70.44
  6. Step 6: Final answer
    x = 91.19

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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.