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Finding the Fourth Proportional to 318.79, 439.92 and 187.80

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Solution

The fourth proportional to 318.79, 439.92 and 187.80 is: 259.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.79 : 439.92 = 187.80 : x
  2. Step 2: Convert to fraction form
    318.79/439.92 = 187.80/x
  3. Step 3: Cross multiply
    318.79x = 439.92 × 187.80
  4. Step 4: Simplify right side
    318.79x = 82,616.98
  5. Step 5: Solve for x
    x = 82,616.98/318.79
  6. Step 6: Final answer
    x = 259.16

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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.