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Finding the Fourth Proportional to 391.26, 586.95 and 208.74

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Solution

The fourth proportional to 391.26, 586.95 and 208.74 is: 313.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.26 : 586.95 = 208.74 : x
  2. Step 2: Convert to fraction form
    391.26/586.95 = 208.74/x
  3. Step 3: Cross multiply
    391.26x = 586.95 × 208.74
  4. Step 4: Simplify right side
    391.26x = 122,519.94
  5. Step 5: Solve for x
    x = 122,519.94/391.26
  6. Step 6: Final answer
    x = 313.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.