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Finding the Fourth Proportional to 310.88, 426.64 and 278.30

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Solution

The fourth proportional to 310.88, 426.64 and 278.30 is: 381.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.88 : 426.64 = 278.30 : x
  2. Step 2: Convert to fraction form
    310.88/426.64 = 278.30/x
  3. Step 3: Cross multiply
    310.88x = 426.64 × 278.30
  4. Step 4: Simplify right side
    310.88x = 118,733.91
  5. Step 5: Solve for x
    x = 118,733.91/310.88
  6. Step 6: Final answer
    x = 381.93

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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.