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Finding the Fourth Proportional to 318.09, 439.02 and 187.08

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Solution

The fourth proportional to 318.09, 439.02 and 187.08 is: 258.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.09 : 439.02 = 187.08 : x
  2. Step 2: Convert to fraction form
    318.09/439.02 = 187.08/x
  3. Step 3: Cross multiply
    318.09x = 439.02 × 187.08
  4. Step 4: Simplify right side
    318.09x = 82,131.86
  5. Step 5: Solve for x
    x = 82,131.86/318.09
  6. Step 6: Final answer
    x = 258.20

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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.