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Finding the Fourth Proportional to 231.10, 346.59 and 76.98

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Solution

The fourth proportional to 231.10, 346.59 and 76.98 is: 115.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.10 : 346.59 = 76.98 : x
  2. Step 2: Convert to fraction form
    231.10/346.59 = 76.98/x
  3. Step 3: Cross multiply
    231.10x = 346.59 × 76.98
  4. Step 4: Simplify right side
    231.10x = 26,680.50
  5. Step 5: Solve for x
    x = 26,680.50/231.10
  6. Step 6: Final answer
    x = 115.45

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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.