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Finding the Fourth Proportional to 231.45, 345.13 and 229.40

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Solution

The fourth proportional to 231.45, 345.13 and 229.40 is: 342.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.45 : 345.13 = 229.40 : x
  2. Step 2: Convert to fraction form
    231.45/345.13 = 229.40/x
  3. Step 3: Cross multiply
    231.45x = 345.13 × 229.40
  4. Step 4: Simplify right side
    231.45x = 79,171.10
  5. Step 5: Solve for x
    x = 79,171.10/231.45
  6. Step 6: Final answer
    x = 342.07

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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.