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Finding the Fourth Proportional to 318.61, 439.73 and 202.51

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Solution

The fourth proportional to 318.61, 439.73 and 202.51 is: 279.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.61 : 439.73 = 202.51 : x
  2. Step 2: Convert to fraction form
    318.61/439.73 = 202.51/x
  3. Step 3: Cross multiply
    318.61x = 439.73 × 202.51
  4. Step 4: Simplify right side
    318.61x = 89,049.72
  5. Step 5: Solve for x
    x = 89,049.72/318.61
  6. Step 6: Final answer
    x = 279.49

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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.