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Finding the Fourth Proportional to 465.18, 641.48 and 299.40

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Solution

The fourth proportional to 465.18, 641.48 and 299.40 is: 412.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.18 : 641.48 = 299.40 : x
  2. Step 2: Convert to fraction form
    465.18/641.48 = 299.40/x
  3. Step 3: Cross multiply
    465.18x = 641.48 × 299.40
  4. Step 4: Simplify right side
    465.18x = 192,057.62
  5. Step 5: Solve for x
    x = 192,057.62/465.18
  6. Step 6: Final answer
    x = 412.87

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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.