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Finding the Fourth Proportional to 85.36, 117.64 and 60.79

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Solution

The fourth proportional to 85.36, 117.64 and 60.79 is: 83.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.36 : 117.64 = 60.79 : x
  2. Step 2: Convert to fraction form
    85.36/117.64 = 60.79/x
  3. Step 3: Cross multiply
    85.36x = 117.64 × 60.79
  4. Step 4: Simplify right side
    85.36x = 7,151.34
  5. Step 5: Solve for x
    x = 7,151.34/85.36
  6. Step 6: Final answer
    x = 83.78

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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.