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Finding the Fourth Proportional to 318.87, 439.61 and 202.41

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Solution

The fourth proportional to 318.87, 439.61 and 202.41 is: 279.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.87 : 439.61 = 202.41 : x
  2. Step 2: Convert to fraction form
    318.87/439.61 = 202.41/x
  3. Step 3: Cross multiply
    318.87x = 439.61 × 202.41
  4. Step 4: Simplify right side
    318.87x = 88,980.45
  5. Step 5: Solve for x
    x = 88,980.45/318.87
  6. Step 6: Final answer
    x = 279.05

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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.