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Finding the Fourth Proportional to 312.67, 468.60 and 231.40

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Solution

The fourth proportional to 312.67, 468.60 and 231.40 is: 346.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.67 : 468.60 = 231.40 : x
  2. Step 2: Convert to fraction form
    312.67/468.60 = 231.40/x
  3. Step 3: Cross multiply
    312.67x = 468.60 × 231.40
  4. Step 4: Simplify right side
    312.67x = 108,434.04
  5. Step 5: Solve for x
    x = 108,434.04/312.67
  6. Step 6: Final answer
    x = 346.80

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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.