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Finding the Fourth Proportional to 92.10, 137.36 and 86.42

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Solution

The fourth proportional to 92.10, 137.36 and 86.42 is: 128.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.10 : 137.36 = 86.42 : x
  2. Step 2: Convert to fraction form
    92.10/137.36 = 86.42/x
  3. Step 3: Cross multiply
    92.10x = 137.36 × 86.42
  4. Step 4: Simplify right side
    92.10x = 11,870.65
  5. Step 5: Solve for x
    x = 11,870.65/92.10
  6. Step 6: Final answer
    x = 128.89

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.