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Finding the Fourth Proportional to 313.69, 432.49 and 247.18

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Solution

The fourth proportional to 313.69, 432.49 and 247.18 is: 340.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.69 : 432.49 = 247.18 : x
  2. Step 2: Convert to fraction form
    313.69/432.49 = 247.18/x
  3. Step 3: Cross multiply
    313.69x = 432.49 × 247.18
  4. Step 4: Simplify right side
    313.69x = 106,902.88
  5. Step 5: Solve for x
    x = 106,902.88/313.69
  6. Step 6: Final answer
    x = 340.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.