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Finding the Fourth Proportional to 310.88, 429.29 and 281.72

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Solution

The fourth proportional to 310.88, 429.29 and 281.72 is: 389.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.88 : 429.29 = 281.72 : x
  2. Step 2: Convert to fraction form
    310.88/429.29 = 281.72/x
  3. Step 3: Cross multiply
    310.88x = 429.29 × 281.72
  4. Step 4: Simplify right side
    310.88x = 120,936.02
  5. Step 5: Solve for x
    x = 120,936.02/310.88
  6. Step 6: Final answer
    x = 389.02

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.