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Finding the Fourth Proportional to 242.40, 333.12 and 231.12

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Solution

The fourth proportional to 242.40, 333.12 and 231.12 is: 317.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    242.40 : 333.12 = 231.12 : x
  2. Step 2: Convert to fraction form
    242.40/333.12 = 231.12/x
  3. Step 3: Cross multiply
    242.40x = 333.12 × 231.12
  4. Step 4: Simplify right side
    242.40x = 76,990.69
  5. Step 5: Solve for x
    x = 76,990.69/242.40
  6. Step 6: Final answer
    x = 317.62

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.