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Finding the Fourth Proportional to 70.91, 97.91 and 57.17

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Solution

The fourth proportional to 70.91, 97.91 and 57.17 is: 78.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.91 : 97.91 = 57.17 : x
  2. Step 2: Convert to fraction form
    70.91/97.91 = 57.17/x
  3. Step 3: Cross multiply
    70.91x = 97.91 × 57.17
  4. Step 4: Simplify right side
    70.91x = 5,597.51
  5. Step 5: Solve for x
    x = 5,597.51/70.91
  6. Step 6: Final answer
    x = 78.94

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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.