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Finding the Fourth Proportional to 70.51, 97.16 and 66.91

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Solution

The fourth proportional to 70.51, 97.16 and 66.91 is: 92.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.51 : 97.16 = 66.91 : x
  2. Step 2: Convert to fraction form
    70.51/97.16 = 66.91/x
  3. Step 3: Cross multiply
    70.51x = 97.16 × 66.91
  4. Step 4: Simplify right side
    70.51x = 6,500.98
  5. Step 5: Solve for x
    x = 6,500.98/70.51
  6. Step 6: Final answer
    x = 92.20

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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.