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Finding the Fourth Proportional to 228.12, 342.20 and 99.88

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Solution

The fourth proportional to 228.12, 342.20 and 99.88 is: 149.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.12 : 342.20 = 99.88 : x
  2. Step 2: Convert to fraction form
    228.12/342.20 = 99.88/x
  3. Step 3: Cross multiply
    228.12x = 342.20 × 99.88
  4. Step 4: Simplify right side
    228.12x = 34,178.94
  5. Step 5: Solve for x
    x = 34,178.94/228.12
  6. Step 6: Final answer
    x = 149.83

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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.