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Finding the Fourth Proportional to 194.40, 291.36 and 85.92

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Solution

The fourth proportional to 194.40, 291.36 and 85.92 is: 128.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    194.40 : 291.36 = 85.92 : x
  2. Step 2: Convert to fraction form
    194.40/291.36 = 85.92/x
  3. Step 3: Cross multiply
    194.40x = 291.36 × 85.92
  4. Step 4: Simplify right side
    194.40x = 25,033.65
  5. Step 5: Solve for x
    x = 25,033.65/194.40
  6. Step 6: Final answer
    x = 128.77

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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.