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Finding the Fourth Proportional to 298.70, 411.72 and 228.68

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Solution

The fourth proportional to 298.70, 411.72 and 228.68 is: 315.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.70 : 411.72 = 228.68 : x
  2. Step 2: Convert to fraction form
    298.70/411.72 = 228.68/x
  3. Step 3: Cross multiply
    298.70x = 411.72 × 228.68
  4. Step 4: Simplify right side
    298.70x = 94,152.13
  5. Step 5: Solve for x
    x = 94,152.13/298.70
  6. Step 6: Final answer
    x = 315.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.