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Finding the Fourth Proportional to 391.23, 586.94 and 208.53

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Solution

The fourth proportional to 391.23, 586.94 and 208.53 is: 312.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.23 : 586.94 = 208.53 : x
  2. Step 2: Convert to fraction form
    391.23/586.94 = 208.53/x
  3. Step 3: Cross multiply
    391.23x = 586.94 × 208.53
  4. Step 4: Simplify right side
    391.23x = 122,393.56
  5. Step 5: Solve for x
    x = 122,393.56/391.23
  6. Step 6: Final answer
    x = 312.84

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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.