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Finding the Fourth Proportional to 151.99, 228.04 and 129.21

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Solution

The fourth proportional to 151.99, 228.04 and 129.21 is: 193.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.99 : 228.04 = 129.21 : x
  2. Step 2: Convert to fraction form
    151.99/228.04 = 129.21/x
  3. Step 3: Cross multiply
    151.99x = 228.04 × 129.21
  4. Step 4: Simplify right side
    151.99x = 29,463.91
  5. Step 5: Solve for x
    x = 29,463.91/151.99
  6. Step 6: Final answer
    x = 193.86

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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.