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Finding the Fourth Proportional to 85.06, 117.03 and 77.86

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Solution

The fourth proportional to 85.06, 117.03 and 77.86 is: 107.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.06 : 117.03 = 77.86 : x
  2. Step 2: Convert to fraction form
    85.06/117.03 = 77.86/x
  3. Step 3: Cross multiply
    85.06x = 117.03 × 77.86
  4. Step 4: Simplify right side
    85.06x = 9,111.96
  5. Step 5: Solve for x
    x = 9,111.96/85.06
  6. Step 6: Final answer
    x = 107.12

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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.