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Finding the Fourth Proportional to 308.88, 429.21 and 305.51

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Solution

The fourth proportional to 308.88, 429.21 and 305.51 is: 424.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.88 : 429.21 = 305.51 : x
  2. Step 2: Convert to fraction form
    308.88/429.21 = 305.51/x
  3. Step 3: Cross multiply
    308.88x = 429.21 × 305.51
  4. Step 4: Simplify right side
    308.88x = 131,125.80
  5. Step 5: Solve for x
    x = 131,125.80/308.88
  6. Step 6: Final answer
    x = 424.52

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.