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Finding the Fourth Proportional to 318.70, 439.88 and 187.79

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Solution

The fourth proportional to 318.70, 439.88 and 187.79 is: 259.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.70 : 439.88 = 187.79 : x
  2. Step 2: Convert to fraction form
    318.70/439.88 = 187.79/x
  3. Step 3: Cross multiply
    318.70x = 439.88 × 187.79
  4. Step 4: Simplify right side
    318.70x = 82,602.98
  5. Step 5: Solve for x
    x = 82,602.98/318.70
  6. Step 6: Final answer
    x = 259.19

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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.