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Finding the Fourth Proportional to 228.28, 342.14 and 99.76

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Solution

The fourth proportional to 228.28, 342.14 and 99.76 is: 149.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.28 : 342.14 = 99.76 : x
  2. Step 2: Convert to fraction form
    228.28/342.14 = 99.76/x
  3. Step 3: Cross multiply
    228.28x = 342.14 × 99.76
  4. Step 4: Simplify right side
    228.28x = 34,131.89
  5. Step 5: Solve for x
    x = 34,131.89/228.28
  6. Step 6: Final answer
    x = 149.52

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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.