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Finding the Fourth Proportional to 391.60, 586.91 and 342.74

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Solution

The fourth proportional to 391.60, 586.91 and 342.74 is: 513.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.60 : 586.91 = 342.74 : x
  2. Step 2: Convert to fraction form
    391.60/586.91 = 342.74/x
  3. Step 3: Cross multiply
    391.60x = 586.91 × 342.74
  4. Step 4: Simplify right side
    391.60x = 201,157.53
  5. Step 5: Solve for x
    x = 201,157.53/391.60
  6. Step 6: Final answer
    x = 513.68

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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.