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Finding the Fourth Proportional to 207.93, 311.50 and 92.10

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Solution

The fourth proportional to 207.93, 311.50 and 92.10 is: 137.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.93 : 311.50 = 92.10 : x
  2. Step 2: Convert to fraction form
    207.93/311.50 = 92.10/x
  3. Step 3: Cross multiply
    207.93x = 311.50 × 92.10
  4. Step 4: Simplify right side
    207.93x = 28,689.92
  5. Step 5: Solve for x
    x = 28,689.92/207.93
  6. Step 6: Final answer
    x = 137.98

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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.