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Finding the Fourth Proportional to 391.80, 586.44 and 228.96

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Solution

The fourth proportional to 391.80, 586.44 and 228.96 is: 342.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.80 : 586.44 = 228.96 : x
  2. Step 2: Convert to fraction form
    391.80/586.44 = 228.96/x
  3. Step 3: Cross multiply
    391.80x = 586.44 × 228.96
  4. Step 4: Simplify right side
    391.80x = 134,271.30
  5. Step 5: Solve for x
    x = 134,271.30/391.80
  6. Step 6: Final answer
    x = 342.70

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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.