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Finding the Fourth Proportional to 116.12, 174.29 and 85.58

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Solution

The fourth proportional to 116.12, 174.29 and 85.58 is: 128.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.12 : 174.29 = 85.58 : x
  2. Step 2: Convert to fraction form
    116.12/174.29 = 85.58/x
  3. Step 3: Cross multiply
    116.12x = 174.29 × 85.58
  4. Step 4: Simplify right side
    116.12x = 14,914.44
  5. Step 5: Solve for x
    x = 14,914.44/116.12
  6. Step 6: Final answer
    x = 128.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.