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Finding the Fourth Proportional to 116.19, 174.32 and 85.68

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Solution

The fourth proportional to 116.19, 174.32 and 85.68 is: 128.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.19 : 174.32 = 85.68 : x
  2. Step 2: Convert to fraction form
    116.19/174.32 = 85.68/x
  3. Step 3: Cross multiply
    116.19x = 174.32 × 85.68
  4. Step 4: Simplify right side
    116.19x = 14,935.74
  5. Step 5: Solve for x
    x = 14,935.74/116.19
  6. Step 6: Final answer
    x = 128.55

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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.