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Finding the Fourth Proportional to 318.71, 439.86 and 187.70

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Solution

The fourth proportional to 318.71, 439.86 and 187.70 is: 259.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.71 : 439.86 = 187.70 : x
  2. Step 2: Convert to fraction form
    318.71/439.86 = 187.70/x
  3. Step 3: Cross multiply
    318.71x = 439.86 × 187.70
  4. Step 4: Simplify right side
    318.71x = 82,559.52
  5. Step 5: Solve for x
    x = 82,559.52/318.71
  6. Step 6: Final answer
    x = 259.05

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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.