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Finding the Fourth Proportional to 308.88, 423.90 and 279.72

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Solution

The fourth proportional to 308.88, 423.90 and 279.72 is: 383.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.88 : 423.90 = 279.72 : x
  2. Step 2: Convert to fraction form
    308.88/423.90 = 279.72/x
  3. Step 3: Cross multiply
    308.88x = 423.90 × 279.72
  4. Step 4: Simplify right side
    308.88x = 118,573.31
  5. Step 5: Solve for x
    x = 118,573.31/308.88
  6. Step 6: Final answer
    x = 383.88

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.