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Finding the Fourth Proportional to 391.74, 586.89 and 305.34

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Solution

The fourth proportional to 391.74, 586.89 and 305.34 is: 457.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.74 : 586.89 = 305.34 : x
  2. Step 2: Convert to fraction form
    391.74/586.89 = 305.34/x
  3. Step 3: Cross multiply
    391.74x = 586.89 × 305.34
  4. Step 4: Simplify right side
    391.74x = 179,200.99
  5. Step 5: Solve for x
    x = 179,200.99/391.74
  6. Step 6: Final answer
    x = 457.45

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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.