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Finding the Fourth Proportional to 228.06, 342.21 and 99.81

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Solution

The fourth proportional to 228.06, 342.21 and 99.81 is: 149.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.06 : 342.21 = 99.81 : x
  2. Step 2: Convert to fraction form
    228.06/342.21 = 99.81/x
  3. Step 3: Cross multiply
    228.06x = 342.21 × 99.81
  4. Step 4: Simplify right side
    228.06x = 34,155.98
  5. Step 5: Solve for x
    x = 34,155.98/228.06
  6. Step 6: Final answer
    x = 149.77

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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.